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John Chernega Phones & Addresses

  • 1429 Sweet Grass, Hudson, WI 54016 (715) 377-7635
  • 11657 72Nd St, Ocala, FL 34476 (352) 237-0583
  • Stillwater, MN
  • Saint Paul, MN
  • Winona, MN
  • Chicago, IL

Publications

Us Patents

Flexible Magnetic Recording Media Lubricated With Fluorinated Telechelic Polyether Polymer

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US Patent:
42672384, May 12, 1981
Filed:
Dec 18, 1979
Appl. No.:
6/100699
Inventors:
John G. Chernega - Stillwater MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
G11B 578
B32B 2728
US Classification:
428422
Abstract:
Flexible magnetic recording tape is lubricated by a thin coating of a fluorinated telechelic polyether polymer having at least one polar group such as --CONHCH. sub. 2 CH. sub. 2 OH, --COOCH. sub. 3, --CH. sub. 2 OH, and --COCF. sub. 3. This is believed to provide for the first time reliably effective lubrication at 40. degree. C. and 80% relative humidity.

Lubricant System For Magnetic Recording Media Containing Isomeric Acids Or Alcohols

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US Patent:
45956405, Jun 17, 1986
Filed:
Dec 27, 1983
Appl. No.:
6/565415
Inventors:
John G. Chernega - Stillwater MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
G11B 572
US Classification:
428695
Abstract:
An improved lubricant system for magnetic recording media such as helical scan video tapes is disclosed. The resulting improved magnetic recording media comprise the usual flexible or rigid backing and a magnetizable layer on the backing, but the lubricant is comprised of an organic compound selected from the group consisting of isomeric carboxylic acids and isomeric alcohols (e. g. iso-stearic acid and iso-stearyl alcohol). A fatty acid ester may be included in the lubricant. A typical composition utilizes 0. 5 parts by weight iso-stearic acid per 100 parts of magnetizable material (e. g. , cobalt doped ferric oxide particles) and 1 part by weight of isopropyl palmitate per 100 parts of the magnetizable material. Video tapes lubricated with this new system, have shown improved electromagnetic output (e. g. , higher signal-to-noise ratios).

Stretched Surface Recording Medium

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US Patent:
48356476, May 30, 1989
Filed:
Jul 2, 1987
Appl. No.:
7/069328
Inventors:
John G. Chernega - Stillwater MN
John A. Martens - Lino Lakes Township, County of Anoka MN
Felix P. Lau - Woodbury MN
Leslie M. Milner - St. Paul MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
G11B 582
G11B 584
B05D 506
B32B 3100
US Classification:
360135
Abstract:
Stretched surface recording disk (SSR) 10 comprising an annular support 12 having raised annular ridges 28 and 42 at its inside and outside diameters 22 and 30 with a base portion 24 in between the two ridges, and an annular recording medium film 14 held in radial tension and stretched across the base portion by adhering the film to attachment surfaces 48 and 36 near the inside and outside diameters respectively. The bond between the recording medium film and the support at the inner and outer attachment surfaces is formed by an electron beam cured adhesive such as a mixture of hydantoin hexacrylate and dimethylacrylamide. By manufacturing the stretched surface recording disks with the e-beam process, significantly less time is required to adhere each stretched recording medium to its suppport, and the quality of the bond between the support and recording medium film is improved. SSR are capable of higher bit density than floppy disks of equivalent surface area and are not as sensitive to contact between the media and a flying magnetic head ("head crashes") as rigid disks.

Recording Media Containing Alkyl Acrylate Copolymers

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US Patent:
47833700, Nov 8, 1988
Filed:
May 28, 1986
Appl. No.:
6/868134
Inventors:
John G. Chernega - Stillwater MN
John A. Martens - North Oaks MN
Roger A. Olsen - Woodbury MN
Auburn B. Cottinham - late of Lake Elmo MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
G11B 5702
US Classification:
4284259
Abstract:
Magnetic recording media have been made with a new class of binder resins having the formula ##STR1## wherein the portion of the copolymer having the a subscript comprises 50 to 97 weight percent of the copolymer, the portion of the copolymer having the b subscript comprises 0 to 30 weight percent of the copolymer, the portions of the copolymer having the c and d subscripts combined comprise 0. 1 to 20 weight percent of the copolymer, while d can be 0, R. sub. 1 is an alkyl group selected from --CH. sub. 3 and --(CH. sub. 2). sub. nl CH. sub. 3 wherein nl=1-10, R. sub. 2 is an alkylene group which may be (CH. sub. 2). sub. n1 or (CH. sub. 2). sub. n2 (CH)(CH. sub. 2). sub. n3 CH. sub. 3, n2=1-4 and n3=0-4, R. sub. 3 may be selected from --H and --CH. sub.

Method For Making Stretched Surface Recording Disk

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US Patent:
49632094, Oct 16, 1990
Filed:
Mar 1, 1989
Appl. No.:
7/317817
Inventors:
John G. Chernega - Stillwater MN
John A. Martens - Lino Lakes Township, Anoka County MN
Felix P. Lau - Woodbury MN
Leslie M. Milner - St. Paul MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
B32B 3100
G11B 582
G11B 566
G11B 570
US Classification:
156160
Abstract:
Stretched surface recording disk (SSR) 10 comprising an annular support 12 having raised annular ridges 28 and 42 at its inside and outside diameters 22 and 30 with a base portion 24 in between the two ridges, and an annular recording medium film 14 held in radial tension and stretched across the base portion by adhering the film to attachment surfaces 48 and 36 near the inside and outside diameters respectively. The bond between the recording medium film and the support at the inner and outer attachment surfaces is formed by an electron beam cured adhesive such as a mixture of hydantoin hexacrylate and dimethylacrylamide. By manufacturing the stretched surface recording disks with the e-beam process, significantly less time is required to adhere each stretched recording medium to its support, and the quality of the bond between the support and recording medium film is improved. SSR are capable of higher bit density than floppy disks of equivalent surface area and are not as sensitive to contact between the media and a flying magnetic head ("head crashes") as rigid disks.

Magnetic Recording Medium Manufacturing Process

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US Patent:
49237110, May 8, 1990
Filed:
Oct 12, 1989
Appl. No.:
7/420356
Inventors:
John G. Chernega - Stillwater MN
John A. Martens - North Oaks MN
Roger A. Olsen - Woodbury MN
Auburn B. Cottingham - late of Lake Elmo MN
Assignee:
Minnesota Mining and Manufacturing Company - Saint Paul MN
International Classification:
G11B 570
B05D 306
US Classification:
427 44
Abstract:
Magnetic recording media have been made with a new class of binder resins having the formula ##STR1## wherein the portion of the copolymer having the a subscript comprises 50 to 97 weight percent of the copolymer, the portion of the copolymer having the b subscript comprises 0 to 30 weight percent of the copolymer, the portions of the copolymer having the =c and d subscripts combined comprise 0. 1 to 20 weight percent of the copolymer, while d can be 0, R. sub. 1 is an alkyl group selected from --CH. sub. 3 and ##STR2## wherein n1=1-10, R. sub. 2 is an alkylene group which may be --CH. sub. 2). sub. nl or ##STR3## n2=1-4 and n3=0-4, R. sub. 3 may be selected from --H and --CH. sub. 3, n5=0 or 1, and X is a linking group which is stable under electron beam irradiation and may be, for example, ##STR4## R. sub. 4 =C1-6 alkylene, for example, with the proviso that when d=0, there is at least one additional polymer in the binder.

Electron Beam Curable Copolymer Useful In Recording Media

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US Patent:
48898953, Dec 26, 1989
Filed:
Aug 8, 1988
Appl. No.:
7/229278
Inventors:
John G. Chernega - Stillwater MN
John A. Martens - North Oaks MN
Roger A. Olsen - Woodbury MN
Auburn B. Cottingham - late of Elmo MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
C07C12504
US Classification:
525278
Abstract:
Magnetic recording media have been made with a new class of binder resins having the formula ##STR1## wherein the portion of the copolymer having the a subscript comprises 50 to 97 weight percent of the copolymer, the portion of the copolymer having the b subscript comprises 0 to 30 weight percent of the copolymer, the portions of the copolymer having the c and d subscripts combinec comprise, 0. 1 to 20 weight percent of the copolymer, while d can be 0, R. sub. 1 is an alkyl group selected from --CH. sub. 3 and --(CH. sub. 2). sub. n1 CH. sub. 3 wherein n1=1-10, R. sub. 2 is an alkylene group which may be --CH. sub. 2). sub. n1 or --CH. sub. 2). sub. n2 (CH)(CH. sub. 2). sub. n3 CH. sub. 3, n2=1-4 and n3=0-4, R. sub. 3 may be selected from --H and --CH. sub.
John G Chernega from Hudson, WI, age ~77 Get Report