US3752866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate modified polyesters of reduced carboxyl groups
Assignee: Celanese Corp
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Filing: 1971-03-23
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Granted: 1973-08-14
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Expires: 1991-03-23
Abstract
Abstract A PROCESS IS DISCLOSED AND CLAIMED WHICH PROVIDES FOR THE LATE ADDITION OF A POLYCARBONATE TO A FIBER-FORMING POLYESTER METAL WHICH RESULTS IN A POLYESTER HAVING A LOWER LEVEL OF CARBOXYL END GROUPS. THE IMPROVED POLYESTER OF THIS INVENTION EXHIBITS UTILITY IN REINFORCED RUBBER ARTICLES SUCH AS INDUSTRIAL BELTS AND PNEUMATIC TIRE STRUCTURES.
Inventors
- 👤 M Doerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:50
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08L; C08L67/00; C08L67/02
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 |