US2988532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymer of an ethylenically unsaturated compound and maleic anhydride polythioetherglycol reaction product
Assignee: Bayer AG
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Filing: 1956-02-28
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Granted: 1961-06-13
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Expires: 1976-02-28
Abstract
No abstract record available.
Inventors
- 👤 Nischk Gunther
- 👤 Holtschmidt Hans
- 👤 Eisenmann Karl-Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:53
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08F; C08F22/00; C08F22/04; C08F28/00; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6888
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
A COPOLYMER PREPARED BY THE PROCESS WHICH COMPRISES REACTING MALEIC ANTHYDRIDE WITH A POLYTHIOETHER HAVING AN HYDROXYL NUMBER OF FROM ABOUT 150 TO ABOUT 300 AND PREPARED BY A PROCESS WITH COMPRISES REACTING THIODIGLYCOL, 1,4-BUTANEDIOL AND TRIMETHYLOL PROPANE AND SUBSEQUENTLY COPOLYMERZING THE UNSATURATED POLYTHIOETHER THUS PRODUCED WITH STYRENE.
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) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |