Patent US2085257A successfully refreshed from Google Patents.
Patent US3313862A successfully refreshed from Google Patents.
US3313862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of polyethylene terephthalate with polycarbonate
Assignee: Glanzstoff AG
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Filing: 1963-03-08
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Granted: 1967-04-11
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Expires: 1983-03-08
Abstract
No abstract record available.
Inventors
- 👤 Siggel Erhard
- 👤 Roedel Hilmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:24
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR THE PRODUCTION OF A MODIFIED HIGH MOLECULAR WEIGHT FIBER-FORMING POLYESTER WHICH COMPRISES: CO-POLYCONDENSING DIETHYLENE GLLYCOL TEREPTHALLATE WITH ABOUT 0.5 TO 6% BY WEIGHT OF A POLYCARBONIC ACID ESTER OF 4,4''-DIHYDROXYDIPHENYL-2,2-PJROPANE, SAID POLYCARBONIC ACID ESTER HAVING A MEAN MOLECUAR WEIGHT OF AT LEAST ABOUT 15,000 UP TO ABOUT 80,000.
Claim 2
Dependent Claim
51 words
A PROCESS FOR THE PRODUCTION OF A MODIFIED HIGH MOLECULAR WEIGHT FIBER-FORMING POLYESTER WHICH COMPRISES: CO-POLYCONDENSING DIETHYLENE GLLYCOL TEREPTHALLATE WITH ABOUT 0.5 TO 6% BY WEIGHT OF A POLYCARBONIC ACID ESTER OF 4,4''-DIHYDROXYDIPHENYL-2,2-PJROPANE, SAID POLYCARBONIC ACID ESTER HAVING A MEAN MOLECUAR WEIGHT OF AT LEAST ABOUT 15,000 UP TO ABOUT 80,000.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |