Sigurd G Waaben

41374282, Jan 30, 1979

Oct 27, 1977

5/845930

Joseph Federico - Berkeley Heights NJ
Stephen Knight - Murray Hill NJ
Sigurd G. Waaben - Princeton NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H03K 1778

179 1SW

An optically controlled bidirectional (bilateral) electrical switch is formed by a pair of photo-Darlington devices connected in series opposing (back-to-back) relationship between the two controlled terminals of the switch. Each of these photo-Darlington devices is shunted by a separate unidirectional diode element, such as a PN junction diode, arranged to conduct current only in the opposite direction from that of current flow through the corresponding shunted photo-Darlington device in its "on" condition. Four embodiments are shown.

44409850, Apr 3, 1984

Dec 27, 1982

6/452942

Joseph Federico - Berkeley Heights NJ
Sigurd G. Waaben - Princeton NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H04B 346

1791753F

A toroidal, saturable core reactor (14) is connected in series with the conductors (11,19 and 13,21) of a transmission line. A termination network (16) is connected across the transmission line conductors (19,21). In response to an a. c. test signal transmitted from a generator (48) on one of the conductors (11), a series of voltage spikes are induced at the reactor (14) and superimposed on the a. c. test signal. The superimposed a. c. test signal is returned through the termination network (16) and the other line conductor (13) to a current detector (50) for detecting the spikes. A d. c. signal is then applied along with the a. c. signal. If there is a fault beyond the reactor (14), the spikes will be displaced from their expected positions. If there is a fault before reactor (14), the spikes will not be displaced. For ease in signal discrimination against noise, the d. c.

45190240, May 21, 1985

Sep 2, 1983

6/528899

Joseph Federico - Berkeley Heights NJ
Sigurd G. Waaben - Princeton NJ

AT&T Bell Laboratories - Murray Hill NJ

H02N 7217

363127

A two-terminal rectifier circuit, useful for converting an input a. c. voltage into an output d. c. voltage, is formed by a power MOSFET which is provided with an electrical feedback comparator network designed to turn on the MOSFET once during each a. c. cycle when the input a. c. voltage is nearly equal to its peak positive value.

43191444, Mar 9, 1982

May 22, 1980

6/152483

William C. King - Chatham Township, Morris County NJ
Dennis J. Lynes - Madison NJ
Charles E. Riehm - Melbourne Beach FL
Sigurd G. Waaben - Princeton NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H03K 522
H03K 342

307236

A circuit with low impedance for maintaining a single polarity at an output is disclosed. Switching is provided by light controlled switching devices which in one embodiment are field effect transistors (14, 15, 16, 17) which are optically triggered by one or more photo-responsive devices (26', 27', 28', 29') coupled to their gate electrodes. The ON-OFF state of each switch is determined by the presence or absence of light from an adjacent line-powered LED (26, 27, 28, 29). A diode (32, 33, 34, 35) may be included in parallel with each switching device to provide surge protection.

41907477, Feb 26, 1980

Apr 5, 1978

5/893795

Alexander Feiner - Rumson NJ
Chao Kai Liu - Matawan NJ
Sigurd G. Waaben - Princeton NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H04B 158
H04B 900

179170NC

A remote gain controlled optocoupled device is disclosed utilizing a DC reference voltage in the output section to compensate for variations in the optocoupling characteristics of the circuit. The DC voltage level output of the photodetector, which is a function of the light transfer characteristics of the circuit, is compared to a remotely controlled reference DC level. The output AC signal level, which substantially tracks the DC voltage output, is gain adjusted under control of the compared DC voltage levels.

40567192, Nov 1, 1977

Aug 2, 1976

5/710562

Sigurd Gunther Waaben - Princeton NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

G01J 132
H03F 1700
H04B 900

250199

A two-way transmission system, which utilizes solid state circuitry and a pair of opto-couplers, achieves high linearity and provides high electrical isolation between input and output signals without the use of the traditional hybrid transformer. Each opto-coupler includes a single light emitting diode (LED), two light detecting diodes (LDDs), and an amplifier. The LED is connected to the output of the amplifier and is physically located with respect to the two LDDs such that light emitted by the LED impinges on the photosensitive areas of the LDDs. The first LDD is coupled to the input of the amplifier, and the second LDD is coupled to output circuitry. This opto-coupler is relatively temperature insensitive and compensates for the inherent nonlinearity of the LED. These characteristics facilitate the use of the opto-coupler in systems which require relatively high linearity and temperature stability.

46313559, Dec 23, 1986

Dec 18, 1984

6/682780

Joseph Federico - Berkeley Heights NJ
Sigurd G. Waaben - Princeton NJ

AT&T Bell Laboratories - Murray Hill NJ

G08C 2100

178 18

The position (XY coordinate) of a pointed stylus on a conductive sheet is determined by injecting current from the stylus into the sheet and measuring the current responses at three or more spaced apart electrodes connected to the sheet.

43497764, Sep 14, 1982

Oct 20, 1980

6/198286

Joseph Federico - Berkeley Heights NJ
Sigurd G. Waaben - Princeton NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

G05F 160

323222

Light-activated power FETs (18, 20, 80, 82) are utilized as switching elements in DC-to-DC converters. The FETs are characterized by high speed and low losses. As a result, the converters are capable of providing very low DC voltages in an efficient low-cost way.