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Patent US3700644A successfully refreshed from Google Patents.
US3700644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep dyeable copolyester resins
Assignee: FMC Corp
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Filing: 1971-03-31
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Granted: 1972-10-24
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Expires: 1991-03-31
Abstract
Abstract A COPOLYESTER RESIN PRODUCT OF (A) AN AROMATIC DICARBOXYLIC ACID OR ITS LOWER ALKYL DIESTER, (B) A GLYCOL AND (C) A MINOR AMOUNT OF A COMPOUND REPRESENTED BY THE FORMULA 1-(Z-R2-N(-R1)-O2S-),3-R-BENZENE WHEREIN R IS -COOR3 OR -SO2-N(-R1)-R2-Z R1 IS A LOWER ALKYL RADICAL CONTAINING FROM 1 TO 6 CARBON ATOMS, R2 IS A C2 TO C6 ALKYLENE RADICAL, R3 IS HYDROGEN OR A LOWER ALKYL RADICAL CONTAINING FROM 1 TO 6 CARBON ATOMS, AND Z IS A HYDROXYL OR -COOR3 RADICAL.
Inventors
- 👤 John A Price
- 👤 Mary J Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:31
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; Y; Y10; Y10S; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |