US4376519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricant sheet for magnetic tape cassette
Assignee: TDK Corp
•
Filing: 1981-06-09
•
Granted: 1983-03-15
•
Expires: 2001-06-09
Abstract
Abstract A lubricant sheet for a magnetic tape cassette characterized in that at least one side of a base incorporating an antistatic agent is provided with a release type silicone coating. This lubricant sheet combines the transparency derived from the use of the clear base and coating materials with the low friction characteristic and the antistatic property to suit the application as such for transparent tape cassette cases.
Inventors
- 👤 Toshihiko Ishida
- 👤 Hitoshi Azegami
- 👤 Yoshio Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:23
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757; G11B23/08764; C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/506; C09K8/508; C09K8/514; Y; Y10; Y10S; Y10S242/00; Y10S242/90; Y10S242/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A magnetic tape cassette wherein substantially the entire inside of the cassette is visible from the outside comprising a length of magnetic tape wound on a pair of reels housed in a transparent case formed from an upper half-case and a lower half-case fastened together, and a transparent lubricant sheet comprising a transparent base incorporating an antistatic agent, and a releasetype silicone coating adhered to at least one side of said base, said lubricant sheet disposed between said reels and the inner surfaces of said half-cases such that a silicone-coated side of said lubricant sheet faces said reels.
Claim 2
Dependent Claim
98 words
A magnetic tape cassette wherein substantially the entire inside of the cassette is visible from the outside comprising a length of magnetic tape wound on a pair of reels housed in a transparent case formed from an upper half-case and a lower half-case fastened together, and a transparent lubricant sheet comprising a transparent base incorporating an antistatic agent, and a releasetype silicone coating adhered to at least one side of said base, said lubricant sheet disposed between said reels and the inner surfaces of said half-cases such that a silicone-coated side of said lubricant sheet faces said reels.
References Cited (Backward Citations)
US3529788A
Cited
US3556434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |