US3882185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid-modified polyterephthalic acid esters
Assignee: Bayer AG
•
Filing: 1973-05-18
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Granted: 1975-05-06
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Expires: 1993-05-18
Abstract
Abstract Acid-modified terephthalic acid polyesters containing structural elements of 2-sulfonatomethyl-propanediol-(1,3). The polyesters are easily dyeable with basic dyestuffs and can be spun from the melt into filaments.
Inventors
- 👤 Eduard Radlmann
- 👤 Eugen Velker
- 👤 Francis Bentz
- 👤 Gunther Nischk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886; Y; Y10; Y10S; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
A HIGH MOLECULAR WEIGHT LINEAR TERPEHTHALIC ACID COPOLYESTER WHICH CONTAINS SULFONATE GROUPS, WHICH COPOLYESTER CONSISTS ESSENTIALLY OF RECURRENT STRUCTURAL ELEMENTS OF THE GENERAL FORMULA
Claim 2
Dependent Claim
24 words
A HIGH MOLECULAR WEIGHT LINEAR TERPEHTHALIC ACID COPOLYESTER WHICH CONTAINS SULFONATE GROUPS, WHICH COPOLYESTER CONSISTS ESSENTIALLY OF RECURRENT STRUCTURAL ELEMENTS OF THE GENERAL FORMULA
Claim 3
Dependent Claim
20 words
The copolyester of claim 1 which consists of from 99 - 70 mols-% of recurrent structural elements of the formula
Claim 4
Dependent Claim
19 words
The copolyester of claim 1 in which, in the general formula of claim 1, M represents an alkali metal.
Claim 5
Dependent Claim
14 words
A filament produced from the solvent-free melt of a copolyester according to claim 1.
References Cited (Backward Citations)
US3018272A
Cited
US3033824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |