Patent US3869419A successfully refreshed from Google Patents.
US3869419A
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Anisotropic dopes of polyamides from fumaric and/or mesaconic acid
Assignee: EIDP Inc
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Filing: 1972-10-27
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Granted: 1975-03-04
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Expires: 1992-10-27
Abstract
Abstract This invention provides novel spinning dopes of polyamides and copolyamides consisting essentially of repeating units of the formula:
Inventors
- 👤 Paul Winthrop Morgan
- 👤 Terry Carl Pletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:58
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01F6/605
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
31 words
A ANIOSOTROPIC DOPE OF A POLYMER IN CONCENTRATED SULFURIC ACID WITHIN THE CONCENTRATION RANGE OF ABOUT 96-105%H2SO4 OR IN FLUOROSULFONIC ACID, SAID POLYMER CONSISTING ESSENTIALLY OF REPEATING UNITS OF THE FORMULA:
Claim 2
Dependent Claim
31 words
A ANIOSOTROPIC DOPE OF A POLYMER IN CONCENTRATED SULFURIC ACID WITHIN THE CONCENTRATION RANGE OF ABOUT 96-105%H2SO4 OR IN FLUOROSULFONIC ACID, SAID POLYMER CONSISTING ESSENTIALLY OF REPEATING UNITS OF THE FORMULA:
Claim 3
Dependent Claim
11 words
The dope of claim 1 wherein the polymer is copoly-(1,4-phenylene fumaramide/terephthalamide).
Claim 4
Dependent Claim
11 words
The dope of claim 1 wherein the polymer is poly-(chloro-1,4-phenylene fumaramide).
References Cited (Backward Citations)
US3671542A
Cited
US3647765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |