US3778409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha,alpha'-bis-(2-hydroxyphenyl)-diisopropyl benzenes as stabilizers for polyurethanes
Assignee: Bayer AG
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Filing: 1971-03-09
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Granted: 1973-12-11
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Expires: 1991-03-09
Abstract
Abstract THE INVENTION RELATES TO A PROCESS FOR STABILISHING POLYURETHANES, PARTICULARLY POLYURETHANE ELASTOMER THREADS AND FILMS, AGAINST DEGRADATION AND DISCOLORATION UNDER THE ACTION OF LIGHT OR UV RADIATION, OXYGEN, ATMOSPHERIC CONSTITUENTS (E.G. NITROGEN OXIDES) AND HEAT BY THE ADDITION OF BISPHENOLS.
Inventors
- 👤 H Oertel
- 👤 E Roos
- 👤 K Ley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:33
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/16; C08K5/34; C08K5/3467; C08K5/3472; C08K5/3475; C07; C07C; C07C2601/00; C07C2601/06; C07C2601/08; C07C2601/12; C07C2601/14
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |