Patent US3752731A successfully refreshed from Google Patents.
US3752731A
Expired / Lapsed
US
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Plastic film made by a film casting article
Assignee: EIDP Inc
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Filing: 1971-09-08
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Granted: 1973-08-14
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Expires: 1991-09-08
Abstract
Abstract A METHOD OF MAKING A FILM CASTING ARTICLE HAVING A CASTING SURFACE CAPABLE OF IMPARTING TO POLYMERIC FILM CAST THEREON AND STRIPPED THEREFROM DESIRABLE OPTICAL AND SLITROLL FORMATION PROPERTIES. THE CASTING SURFACE OF THE FILM CASTING ARTICLE IS POLISHED, BLASTED WITH GRIT, AND STONED AND POLISHED AGAIN TO IMPART CRITICAL "ROUGHNESS" CHARACTERISTICS TO SUCH CASTING SURFACE.
Inventors
- 👤 T Stiegler
- 👤 C Learn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:33
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/42; B29C33/424; B29C39/00; B29C39/02; B29C39/026; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29K; B29K2905/00; B29K2905/08; Y; Y10; Y10S; Y10S205/00; Y10S205/917; Y10T; Y10T29/00; Y10T29/49; Y10T29/49544; Y10T29/4956; Y10T29/49563; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |