Patent US2927906A successfully refreshed from Google Patents.
US2927906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution of polyamides in trifluoroethyl alcohol and process of making same
Assignee: Hoechst AG
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Filing: 1957-04-09
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Granted: 1960-03-08
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Expires: 1977-04-09
Abstract
No abstract record available.
Inventors
- 👤 Schlack Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:28
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/095; C08J2377/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PROCESS FOR THE MANUFACTURE OF SOLUTIONS OF LONG CHAIN SYNTHETIC POLYMERIC AMIDES WHICH HAVE RECURRING AMIDE GROUPS AS AN INTEGRAL PART OF THE MAIN POLYMER CHAIN AND WHICH ATE CAPABLE OF BEING FORMED INTO FIBERS, WHICH COMPRISES DISSOLVING SAID POLYAMIDES IN TRIFLUOROETHYL ALCOHOL.
Claim 2
Dependent Claim
44 words
A PROCESS FOR THE MANUFACTURE OF SOLUTIONS OF LONG CHAIN SYNTHETIC POLYMERIC AMIDES WHICH HAVE RECURRING AMIDE GROUPS AS AN INTEGRAL PART OF THE MAIN POLYMER CHAIN AND WHICH ATE CAPABLE OF BEING FORMED INTO FIBERS, WHICH COMPRISES DISSOLVING SAID POLYAMIDES IN TRIFLUOROETHYL ALCOHOL.
References Cited (Backward Citations)
US1979614A
Cited
US2342387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |