US3857532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed tape cassette
Assignee: Individual
•
Filing: 1973-08-08
•
Granted: 1974-12-31
•
Expires: 1993-08-08
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 buildup 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
2026-11-03 17:39
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: 4
Claim 1
Independent Claim
109 words
A magnetic tape cassette comprising a casing of upper and lower mating halves, a pair of spaced reel hubs within the casing, a plurality of tape guides within the casing, a magnetic tape extending from one of said reel hubs around said guides to the other of said reel hubs, sheets of electrically conductive material lining the inner surfaces of the upper and lower walls of said casing above and below said reel hubs, said upper and lower sheets being provided with tabs which pass through a side wall of the cassette for engagement with ground potential to prevent the buildup of the electrostatic charge on said magnetic tape.
Claim 2
Dependent Claim
109 words
A magnetic tape cassette comprising a casing of upper and lower mating halves, a pair of spaced reel hubs within the casing, a plurality of tape guides within the casing, a magnetic tape extending from one of said reel hubs around said guides to the other of said reel hubs, sheets of electrically conductive material lining the inner surfaces of the upper and lower walls of said casing above and below said reel hubs, said upper and lower sheets being provided with tabs which pass through a side wall of the cassette for engagement with ground potential to prevent the buildup of the electrostatic charge on said magnetic tape.
Claim 3
Dependent Claim
114 words
A magnetic tape cassette comprising a casing of upper and lower mating halves, a pair of spaced reel hubs within the casing, a plurality of tape guides within the casing, a magnetic tape extending from one of said reel hubs around said guide to the other of said reel hubs, sheets of electrically conductive material lining the inner surfaces of the upper and lower walls of said casing above and below said reel hubs, said upper and lower sheets being interconnected through a tab folded upon itself and extending through a seam in a wall of said casing for engagement with ground potential to prevent the buildup of electrostatic charge on said magnetic tape.
Claim 4
Dependent Claim
114 words
A magnetic tape cassette comprising a casing of upper and lower mating halves, a pair of spaced reel hubs within the casing, a plurality of tape guides within the casing, a magnetic tape extending from one of said reel hubs around said guide to the other of said reel hubs, sheets of electrically conductive material lining the inner surfaces of the upper and lower walls of said casing above and below said reel hubs, said upper and lower sheets being interconnected through a tab folded upon itself and extending through a seam in a wall of said casing for engagement with ground potential to prevent the buildup of electrostatic charge on said magnetic tape.
References Cited (Backward Citations)
US3556433A
Cited
US3601654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |