Patent DE1244992B successfully refreshed from Google Patents.
Patent FR2469307A2 successfully refreshed from Google Patents.
US4359569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polyester and filaments
Assignee: EIDP Inc
•
Filing: 1981-07-02
•
Granted: 1982-11-16
•
Expires: 2001-07-02
Abstract
Abstract Fiber-forming aromatic polyester consisting essentially of 6-oxy-2-naphthoyl units, and units derived from certain dihydric phenols, and aromatic dicarboxylic acids.
Inventors
- 👤 Roger K. Siemionko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:52
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/78; D01F6/84; C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
70 words
Melt-spinnable polyesters of fiber-forming molecular weight consisting essentially of units having the structural formulas: ##STR2## in the proportions of about 20 to 30 mol % of unit I, about 20 to 40 mol % of unit II, about 20 to 40 mol % of unit III and from 5 to about 20 mol % of units IV or V, the dioxy and dicarbonyl units being present in substantially equimolar amounts.
Claim 2
Dependent Claim
70 words
Melt-spinnable polyesters of fiber-forming molecular weight consisting essentially of units having the structural formulas: ##STR2## in the proportions of about 20 to 30 mol % of unit I, about 20 to 40 mol % of unit II, about 20 to 40 mol % of unit III and from 5 to about 20 mol % of units IV or V, the dioxy and dicarbonyl units being present in substantially equimolar amounts.
Claim 3
Dependent Claim
7 words
Filaments of the polyester of claim 1.
Claim 4
Dependent Claim
14 words
Polyester according to claim 1 consisting essentially of units I, II, III and IV.
Claim 5
Dependent Claim
7 words
Filaments of the polyester of claim 3.
Claim 6
Dependent Claim
14 words
Polyester according to claim 1 consisting essentially of units I, II, III and V.
Claim 7
Dependent Claim
7 words
Filaments of the polyester of claim 5.
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) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |