US3555115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low molecular weight polyurethanes containing n-t-butyl groups
Assignee: EIDP Inc
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Filing: 1968-05-31
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Granted: 1971-01-12
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Expires: 1988-05-31
Abstract
Abstract POLYURETHANES CONTAINING IN THE POLYMER CHAIN TERTIARY AMINE NITROGEN BEARING A T-BUTYL SUBSTITUENT AND HAVING AN INHERENT VISCOSITY BETWEEN 0.07 AND 0.6 ARE BLENDED WITH LONG-CHAIN SYNTHETIC ELASTOMERIC SEGMENTED POLYURETHANES TO STABILIZE THE LATTER AGAINST DISCOLORATION BY LIGHT AND SMOG. ARTICLES OF SUCH BLENDS ARE MORE RESISTANT TO LOSS OF PHYSICAL PROPERTIES UPON EXPOSURE TO CHLORINE BLEACHES THAN ARE ARTICLES STABILIZED WITH TERTIARY AMINES HERETOFORE USED.
Inventors
- 👤 Charles Gregory Bottomley
- 👤 Oliver Larry Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:56
CPC Classifications
C; C08; C08L; C08L65/00; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G18/3275; C08G61/00; C08G61/02; C08L75/00; C08L75/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |