US3970639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethyl α-cyano β-(N-methyl-N-cyclohexylamino) acrylate stabilizer
Assignee: Wyeth Holdings LLC
•
Filing: 1975-09-22
•
Granted: 1976-07-20
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Expires: 1995-09-22
Abstract
Abstract Polycarbonate is effectively stabilized against degradation by ultraviolet radiation by ethyl α-cyano-β-(N-methyl-N-cyclohexylamino)acrylate.
Inventors
- 👤 William F. Cordes, III
- 👤 Robert E. Diehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:20
CPC Classifications
C; C07; C07C; C07C255/00; C08; C08K; C08K5/00; C08K5/16; C08K5/315
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
20 words
Polycarbonate stabilized against the deteriorating effects of ultraviolet radiation by an effective amount of a stabilizer which is ethyl α-cyano-β-(N-methyl-N-cyclohexylamino)acrylate.
Claim 2
Dependent Claim
20 words
Polycarbonate stabilized against the deteriorating effects of ultraviolet radiation by an effective amount of a stabilizer which is ethyl α-cyano-β-(N-methyl-N-cyclohexylamino)acrylate.
Claim 3
Dependent Claim
24 words
A composition as defined in claim 1 wherein said stabilizer is present in an amount of 0.1 to 5.0 percent on weight of polycarbonate.
Claim 4
Dependent Claim
1 words
α-Cyano-β-(N-methyl-N-cyclohexylamino)acrylate.
Claim 5
Dependent Claim
1 words
α-Cyano-β-(N-methyl-N-cyclohexylamino)acrylate.
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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |