US3637596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of butadiene and/or copolymerizable carboxylic nitriles and other monomers which resist yellowing
Assignee: BASF SE
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Filing: 1969-06-03
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Granted: 1972-01-25
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Expires: 1989-06-03
Abstract
Abstract COPOLYMERS WHICH DO NOT BECOME YELLOW AT ALL OR ONLY BECOME YELLOW AFTER A LONG TIME AND WHICH ARE BASED ON BUTAIDIENE AND/OR CARBOXYLIC NITRILES COPOLYMERIZABLE THEREWITH AND CONTAIN SMALL AMOUNTS OF A COLORED COMPOUN WHICH ABSORBS LIGHT IN THE WAVELENGTH RANGE FROM 570 TO 605 MILLMICRONS AND WHICH BEARS AT LEAST ONE COPOLYMERIABLE GROUP.
Inventors
- 👤 Klaus Gulbins
- 👤 Hans Wilhelm
- 👤 Heinrich Hartmann
- 👤 Albrecht Eckell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:46
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |