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Frederick J Bruwer

from Chandler, AZ
Age ~66
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Also known as:
Frederick Johannes Bruwer, Fredrick J Bruwer, Federick J Bruwer, Fred J Bruwer, Bruwer Frederick
Related to:
Caro M BruwerCarolmari Bruwer
Connected to:
Abraham Bruwer, 51Dirk Bruwer, 53Graham R Bruwer, 53Stephan Bruwer, 61Danielle L Bruwier, 43Thomas G Brux, 65Kelly D Bruxvoort, 60Darren J Bruy, 60David Bruyer, 37Kim J Bruyer, 70

Frederick Bruwer Phones & Addresses

  • Chandler, AZ
  • Phoenix, AZ

Publications

Wikipedia

KeeLoq

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The uni-directional command transfer protocol was designed by Frederick Bruwer, PhD, CEO at Nanoteq (Pty) Ltd and the cryptographic algorithm was created by ...

Us Patents

Remote Controlled Garage Door Opening System

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US Patent:
6667684, Dec 23, 2003
Filed:
Mar 8, 2000
Appl. No.:
09/521510
Inventors:
Dennis W. Waggamon - North Canton OH
Willem J. Marneweck - Tempe AZ
Vivien N. Delport - Phoenix AZ
Frederick J. Bruwer - Chandler AZ
Assignee:
Overhead Door Corporation - Dallas TX
Microchip Technology, Inc. - Chandler AZ
International Classification:
B60R 2500
US Classification:
340 571, 340 57, 34082569, 2353825, 70256
Abstract:
A remote control system for opening and closing a barrier, such as a garage door, includes an RF receiver and a plurality of RF transmitters. The transmitters and receiver include circuitry programmed to provide transmission of encrypted code signals each time the transmitters are used and employing a code hopping method which prevents unauthorized signal interception or code âgrabbingâ. The system is operated in a code learning mode for the receiver by momentarily actuating a receiver learn mode button for receiving each transmitter identification code and a secret decryption key for that transmitter with the system automatically returning to the operate mode. Each transmitter identification and secret key code signal is automatically and randomly stored in an available and unused memory in the receiver circuitry. A multibit hopping code is transmitted from each transmitter to the receiver with each transmitter operation in the operate mode of the system and the hopping code changes with each transmission to prevent theft or code grabbing and resultant unauthorized operation of the system.

Method Of Communication Using An Encoder Microchip And A Decoder Microchip

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US Patent:
6985472, Jan 10, 2006
Filed:
Nov 4, 2003
Appl. No.:
10/701216
Inventors:
Frederick Bruwer - Chandler AZ, US
Assignee:
Microchip Technology Incorporated - Chandler AZ
International Classification:
H04Q 1/00
US Classification:
370342, 3408251, 34082556, 342 42
Abstract:
Encoder and decoder microchips suitable for use in remote control devices, are disclosed. The encoder microchip comprises means for performing an encoding function on an identification number embedded in the said microchip and a combination of a unit number and a stepping counter value, so as to generate a transmission value which is only decodable by a related decoding function having access to the same identification number. The decoder microchip comprises means for decoding the transmission value into a decoded unit number and a decoded counter value and means for comparing the decoded counter value with a decoder counter value range. The encoder and decoder microchips are provided with means for changing, e. g. in a preferred mode incrementing, the counter values by a number greater than one after a period of time, subsequent to the encoder microchip being activated or the decoder microchip receiving a transmission value. The encoder and decoder microchips are also provided with means for synchronizing the decoder microchip with a particular encoder microchip which has generated a synchronization command.

Remote Controlled Garage Door Opening System

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US Patent:
20040085185, May 6, 2004
Filed:
Oct 24, 2003
Appl. No.:
10/693748
Inventors:
Dennis Waggamon - Massillon OH, US
Willem Marneweck - Tempe AZ, US
Vivien Delport - Phoenix AZ, US
Frederick Bruwer - Chandler AZ, US
International Classification:
H04Q001/00
US Classification:
340/005700, 340/825720, 340/825690
Abstract:
A remote control system for opening and closing a barrier, such as a garage door, includes an RF receiver and a plurality of RF transmitters. The transmitters and receiver include circuitry programmed to provide transmission of encrypted code signals each time the transmitters are used and employing a code hopping method which prevents unauthorized signal interception or code “grabbing”. The system is operated in a code learning mode for the receiver by momentarily actuating a receiver learn mode button for receiving each transmitter identification code and a secret decryption key for that transmitter with the system automatically returning to the operate mode. Each transmitter identification and secret key code signal is automatically and randomly stored in an available and unused memory in the receiver circuitry. A multibit hopping code is transmitted from each transmitter to the receiver with each transmitter operation in the operate mode of the system and the hopping code changes with each transmission to prevent theft or code grabbing and resultant unauthorized operation of the system.

Adjustable Frequency Stabilizing Internal Chip Capacitor System

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US Patent:
60582944, May 2, 2000
Filed:
Mar 24, 1998
Appl. No.:
9/047779
Inventors:
Frederick J. Bruwer - Chandler AZ
Willem Smit - Chandler AZ
Assignee:
Microchip Technology Incorporated - Chandler AZ
International Classification:
H04B 102
H04R 102
US Classification:
455119
Abstract:
A transmitter system having an adjustable monolithic frequency stabilization and tuning internal capacitor circuit. The transmitter system has a transmitter for generating and transmitting a transmitter oscillator frequency signal. A data generating chip is coupled to the transmitter. The data generating chip is used for adjusting and controlling the transmitter oscillator frequency signal. A variable capacitor circuit is located internal to the data generating chip and is coupled to a ground pin and one of a plurality of function pins on the data generating chip. The variable capacitor circuit is used for adjusting and setting the centerpoint of the transmitter oscillator frequency signal.

Method And Apparatus For Electronic Encoding And Decoding

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US Patent:
56756224, Oct 7, 1997
Filed:
Mar 5, 1996
Appl. No.:
8/611994
Inventors:
Kent Hewitt - Mesa AZ
Willem Smit - Phoenix AZ
Emile van Rooyen - Phoenix AZ
Frederick Bruwer - Phoenix AZ
Assignee:
Microchip Technology Incorporated - Chandler AZ
International Classification:
H03K 2100
US Classification:
377 33
Abstract:
According to the present invention there is provided an encoder, which in one embodiment, includes a processing circuit which generates an output code according to an encoding algorithm, a counter circuit for incrementing a counter value such that only one bit of the counter value changes each time the counter value is incremented, a non-volatile memory for storing the counter value, and a transmitter which transmits the output code and the counter value. In another embodiment of the invention there is provided a method for use with an encoder having a processing circuit which generates an output code according to an encoding algorithm, a counter circuit for incrementing a counter value, a non-volatile memory for storing the counter value, and a transmitter which transmits the output code and the counter value. In one embodiment, the method includes the steps of incrementing the counter value such that only one bit is changed each time the counter is incremented. In still a further embodiment the method includes the steps of using a semaphore register and determining whether the semaphore register is set to 0.

Secure Self Learning System

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US Patent:
61666505, Dec 26, 2000
Filed:
Jun 3, 1997
Appl. No.:
8/868131
Inventors:
Frederick Bruwer - Chandler AZ
Assignee:
Microchip Technology, Inc. - Chandler AZ
International Classification:
H04Q 900
US Classification:
34082531
Abstract:
A method and system for the remote control of devices having a secure self learn capability. The system includes an encoder and a decoder, the encoder encoding variable information including a user key using a non-linear algorithm to produce an encoded value transmitted to the decoder, the decoder decoding the value using the same algorithm. In a learning mode a new encoder is to be added to the system. The new encoder produces an encoded value using a key generation seed. The decoder, upon receiving the encoded key generation seed, produces a decoding key based upon the decoded key generation seed. The decoding key is stored in the decoder memory allowing valid recognition of the new encoder in a secure manner.

Remote Controlled Garage Door Opening System

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US Patent:
60492899, Apr 11, 2000
Filed:
Sep 6, 1996
Appl. No.:
8/706682
Inventors:
Dennis W. Waggamon - North Canton OH
Willem J. Marneweck - Tempe AZ
Vivien N. Delport - Phoenix AZ
Frederick J. Bruwer - Chandler AZ
Assignee:
Overhead Door Corporation - Dallas TX
Microchip Technology, Inc. - Chandler AZ
International Classification:
G06F 704
US Classification:
34082531
Abstract:
A remote control system for opening and closing a barrier, such as a garage door, includes an RF receiver and a plurality of RF transmitters. The transmitters and receiver include circuitry programmed to provide transmission of encrypted code signals each time the transmitters are used and employing a code hopping method which prevents unauthorized signal interception or code "grabbing". The system is operated in a code learning mode for the receiver by momentarily actuating a receiver learn mode button for receiving each transmitter identification code and a secret decryption key for that transmitter with the system automatically returning to the operate mode. Each transmitter identification and secret key code signal is automatically and randomly stored in an available and unused memory in the receiver circuitry. A multibit hopping code is transmitted from each transmitter to the receiver with each transmitter operation in the operate mode of the system and the hopping code changes with each transmission to prevent theft or code grabbing and resultant unauthorized operation of the system.

Fail Safe Non-Volatile Memory Programming System And Method Therefor

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US Patent:
57682089, Jun 16, 1998
Filed:
Jun 18, 1996
Appl. No.:
8/665697
Inventors:
Frederick J. Bruwer - Chandler AZ
Emile Van Rooyen - Phoenix AZ
Willem Smit - Phoenix AZ
Thomas C. Salt - Chandler AZ
Assignee:
Microchip Technology Incorporated - Chandler AZ
International Classification:
G11C 700
US Classification:
365228
Abstract:
The present invention relates to a fail safe non-volatile memory programming system. The system uses a high voltage charging capacitor to store a charge for programming a memory device. A second charging capacitor is used for supplying power to the control logic used for programming the memory device. If power is removed during a programming cycle, the charge stored in the two capacitors is sufficient to complete the programming cycle.
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Frederick J Bruwer from Chandler, AZ, age ~66 Get Report