Patent US3851841A successfully refreshed from Google Patents.
US3851841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed tape cassette
Assignee: Westinghouse Electric Corp
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Filing: 1972-05-18
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Granted: 1974-12-03
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Expires: 1992-05-18
Abstract
Abstract A miniature reel-to-reel magnetic tape cassette for a high speed dubbing system capable of achieving tape speeds as high as 120 inches per second or higher. The cartridge incorporates means for facilitating driving of the tape by a relatively large diameter high speed capstan, utilizes a conductive liner for preventing the build-up of static electricity at the high tape speeds employed, and incorporates self-centering concave rollers around which the high speed tape travels in passing from a pay-off reel to a take-up reel.
Inventors
- 👤 C Bastiaans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:51
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/02; G; G11; G11B; G11B15/00; G11B15/18; G11B15/1883; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757; G11B23/08764; G11B23/08778; G11B5/00; Y; Y10; Y10S; Y10S242/00; Y10S242/906
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
A magnetic tape cassette comprising a casing of upper and lower mating halves, a pair of spaced reels within the casing, means for driving one of said reels whereby a tape speed of at least about 120 inches per second is achieved, a plurality of tape guides within the casing, and a magnetic tape extending from one of said reels around said guides to the other of said reels, each of said guides comprising a roller of the hourglass type of generally concave cross-sectional configuration, the tapeengaging surface of the roller defining an arc of a circle in cross section with the roller being symmetrical about a plane passing through the roller midway between its ends.
Claim 2
Dependent Claim
116 words
A magnetic tape cassette comprising a casing of upper and lower mating halves, a pair of spaced reels within the casing, means for driving one of said reels whereby a tape speed of at least about 120 inches per second is achieved, a plurality of tape guides within the casing, and a magnetic tape extending from one of said reels around said guides to the other of said reels, each of said guides comprising a roller of the hourglass type of generally concave cross-sectional configuration, the tapeengaging surface of the roller defining an arc of a circle in cross section with the roller being symmetrical about a plane passing through the roller midway between its ends.
Claim 3
Dependent Claim
26 words
The cassette of claim 1 wherein said rollers are located at two corners of the cassette and are provided with fixed collars at the edges thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |