US3772081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Embossable magnetic composite film
Assignee: 3M Co
•
Filing: 1971-07-19
•
Granted: 1973-11-13
•
Expires: 1991-07-19
Abstract
Abstract A composite film having a flexible heat-resistant base layer, a heat softenable pressure formable adherent intermediate layer, and a conformable upper layer of a magnetic powder oxide dispersed in a non-magnetic binder. The film can be permanently embossed in its upper surface upon pressure contact with a suitable heated die to provide thereon a guide pattern such as a spiral groove, and is thereafter useful as a sound disc.
Inventors
- 👤 V Franer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:49
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/74; B29L; B29L2017/00; B29L2017/001; B29L2017/003; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/31504; Y10T428/3167; Y10T428/31674; Y10T428/31786
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
26 words
The film of claim 1 wherein said support layer comprises a mixture of a major portion of polyester resin and a minor portion of polysulfone resin.
Claim 2
Dependent Claim
14 words
The film of claim 1 wherein said intermediate layer is comprised of polyester resin.
Claim 3
Dependent Claim
13 words
The film of claim 3 wherein said polyester resin is poly(ethylene glycol-isophthalate/terephthalate) resin.
References Cited (Backward Citations)
US2501126A
Cited
US2857476A
Cited
US2844665A
Cited
US3159078A
Cited
US2819186A
Cited
US3149996A
Cited
US3310421A
Cited
US3502761A
Cited
US3566356A
Cited
US3627330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |