US3269970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinning filaments from solution in concentrated sulfuric acid of a polyamide and salt
Assignee: Celanese Corp
•
Filing: 1964-06-22
•
Granted: 1966-08-30
•
Expires: 1984-06-22
Abstract
No abstract record available.
Inventors
- 👤 Martin E Epstein
- 👤 Arthur W Greenstreet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:22
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01F1/00; D01F1/02; D01F1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A SLUTION IN CONCENTRATED SULFURIC ACID OF AT LEAST 75% BY WEIGHT ACID CONCENTRATED OF A FIBER-FORMING CCONDENSATION POLYMER HAVING REPEATING AMIDE GROUPS AS AN INTEGRAL PART OF THE POLYMER CHAIN AND AT LEAST 1% BASED ON THE WEIGHT OF THE SOLVENT OF A SALT WHICH IS DISSOLVED IN SAID SULFURIC ACID AND YEILDS IONS IN SOLUTON WHICH HAVE AN AFFINITY OF PORTONS AT LEAST EQUAL TO THAT OF BISULFATE IONS, SAID SOLUTION BEING SUITABLE FOR FORMATION INTO SHAPED ARTICLES.
Claim 2
Dependent Claim
80 words
A SLUTION IN CONCENTRATED SULFURIC ACID OF AT LEAST 75% BY WEIGHT ACID CONCENTRATED OF A FIBER-FORMING CCONDENSATION POLYMER HAVING REPEATING AMIDE GROUPS AS AN INTEGRAL PART OF THE POLYMER CHAIN AND AT LEAST 1% BASED ON THE WEIGHT OF THE SOLVENT OF A SALT WHICH IS DISSOLVED IN SAID SULFURIC ACID AND YEILDS IONS IN SOLUTON WHICH HAVE AN AFFINITY OF PORTONS AT LEAST EQUAL TO THAT OF BISULFATE IONS, SAID SOLUTION BEING SUITABLE FOR FORMATION INTO SHAPED ARTICLES.
References Cited (Backward Citations)
US2299839A
Cited
US2342387A
Cited
US2269125A
Cited
US2277788A
Cited
US2489569A
Cited
GB715364A
Cited
US3040003A
Cited
US3154610A
Cited
US3154609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |