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James Wulfing Phones & Addresses

  • Shafer, MN
  • Chisago City, MN
  • 1263 Lealand Rd, Maplewood, MN 55109 (651) 483-0031
  • Saint Paul, MN
  • 3336 River Rd, Medford, WI 54451 (715) 748-9513
  • Lindstrom, MN
  • Stillwater, MN

Publications

Us Patents

Hinged Visor-Type Door For Tape Cassette

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US Patent:
4527755, Jul 9, 1985
Filed:
Oct 17, 1983
Appl. No.:
6/542414
Inventors:
Robert M. Rood - Woodbury MN
James J. Wulfing - Afton MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
G03B 104
G11B 1532
US Classification:
242199
Abstract:
A videotape cassette has a visor-type door, at each end of which is an ear or corner part at which a pin hinges the door to a housing. As in the prior art, the door is biased to either a fully opened or fully closed position. In the novel cassette, the biasing results from a free-standing finger formed in a wall of the housing, which finger acts as a spring against a squarish platform on the inner face of an ear of the door.

Videocassette Tape Spool Having A Wear Button

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US Patent:
4520969, Jun 4, 1985
Filed:
Oct 17, 1983
Appl. No.:
6/542430
Inventors:
James J. Wulfing - Afton MN
Robert M. Rood - Woodbury MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
B65H 7518
G03B 104
G11B 1532
US Classification:
242 718
Abstract:
Videocassette tape spool, the wear button of which is a protuberance of a small plastic piece which may serve to lock the parts of the spool together. By using a small piece for the wear button, substantial savings in raw material can be realized since highly wear-resistant plastics tend to be quite expensive. The novel tape spool also can be assembled less expensively compared to tape spools now used in videocassettes.

Tape Roller For A Tape Cassette

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US Patent:
4515330, May 7, 1985
Filed:
Oct 17, 1983
Appl. No.:
6/542416
Inventors:
James J. Wulfing - Afton MN
Robert M. Rood - Woodbury MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
G03B 104
G11B 1532
B65H 1722
US Classification:
242197
Abstract:
A tape roller has a plastic sleeve which is journalled between bearings formed in opposing walls of a plastic cassette housing. The wall is cored out around at least one of those bearings so that the bearing is supported only by bridges which bow outwardly to receive an oversize sleeve. Preferably there are two such bridges at the bearing, the thicknesses of which are about 20% that of the wall.

Recording Disc Cartridge Having Centrally-Located, Integral, Raised Wear Surface

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US Patent:
5640298, Jun 17, 1997
Filed:
Jul 28, 1995
Appl. No.:
8/509032
Inventors:
James J. Wulfing - Stillwater MN
Assignee:
Imation Corp. - Oakdale MN
International Classification:
G11B 2303
US Classification:
360133
Abstract:
A cartridge including a cover casing, a back casing, and a disc-shaped medium provided between the casings. The cover casing has a centrally-located, raised surface on its interior surface which is chemically and physically integral with the cover casing. When the cartridge is inserted into a drive for reading/writing the medium, a drive pin from the drive contacts the raised surface. The cover casing is comprised of high-impact polystyrene containing silicone.

Braking Mechanism For Cassette Tape Reel

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US Patent:
4472753, Sep 18, 1984
Filed:
Oct 24, 1983
Appl. No.:
6/544867
Inventors:
James J. Wulfing - Afton MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
G11B 2302
G11B 1512
G03B 104
B65H 1748
US Classification:
360132
Abstract:
The length of tape that can be wound into a videotape cassette such as Betamax or VHS can be increased by modifying the casette to employ the braking mechanism of the invention. This involves a flanged reel in which teeth are formed only in the outer face of one flange, and a brake lever which has a finger formed with a tooth-engaging ramp that is inclined at 30. degree. -60. degree. to the inner face of said flange when the finger fits between adjacent teeth.

Tape Spool

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US Patent:
4515323, May 7, 1985
Filed:
Oct 17, 1983
Appl. No.:
6/542415
Inventors:
Robert M. Rood - Woodbury MN
James J. Wulfing - Afton MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
B65H 7528
US Classification:
242 741
Abstract:
A prior tape spool comprises two hub parts which are wedged together to pinch a tape leader between the walls of a narrow passage that opens through the tape-winding surface. The novel tape spool differs from the prior tape spool in that the passage pinches the leader only in a region remote from the opening through the tape-winding surface, so that if the leader is accidentally crimped or off center, it would tend to straighten out before emerging from the opening.

Lanced Shutter Tab For Disk Cartridges

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US Patent:
5189586, Feb 23, 1993
Filed:
Feb 21, 1991
Appl. No.:
7/658547
Inventors:
Paul D. Rumpza - Roseville MN
James J. Wulfing - Stillwater MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
G11B 2303
US Classification:
360133
Abstract:
A disk cartridge including a rotatable disk, a cartridge case for housing the disk, and a U-shaped shutter slidably disposed on the front wall of the cartridge case is disclosed. The cartridge case includes upper and lower walls, and a head access opening formed in both walls between a central axis and the front wall to access the disk. The access opening is opened and closed by the shutter which is biased closed. An indented portion is formed on the walls for receiving the shutter. Two tabs are formed in one shutter arm portion and are received in a slot formed in the cartridge case.

Videocassette Tape Spool Having A Wear Button

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US Patent:
4752046, Jun 21, 1988
Filed:
Jun 10, 1986
Appl. No.:
6/872543
Inventors:
James J. Wulfing - Afton MN
Assignee:
Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:
B65H 7518
US Classification:
242 718
Abstract:
A tape spool provides resistance to disassembly from shocks caused by rough handling by providing an annular hub projection extending axially of the spool hub to define a shoulder which interacts with an inner radial wall of a disk providing the second flange of the spool. The inner radial wall of the disk defines a central hole surrounding the hub projection, with contact between the radial wall of the disk and the shoulder of the hub restricting radial movement of the disk with respect to the hub. The disk and the hub also may include intermeshing splines which prevent relative rotation of the disk and the hub.
James J Wulfing from Shafer, MN, age ~82 Get Report