Patent US3134752A successfully refreshed from Google Patents.
US3134752A
Expired / Lapsed
US
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Polystyrene color stabilized with trialkyl phenol and a benzophenone
Assignee: Wyeth Holdings LLC
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Filing: 1962-01-30
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Granted: 1964-05-26
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Expires: 1982-01-30
Abstract
No abstract record available.
Inventors
- 👤 Costello Leo
- 👤 Jerome L Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:55
CPC Classifications
C; C07; C07C; C07C255/00; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/132; C08K5/16; C08K5/315; C08K5/34; C08K5/3467; C08K5/3477; C08K5/3492
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A POLYSTYRENE COMPOSITION PROTECTED FROM DEVELOPING EXCESSIVE YELLOW COLORATION ON EXTEND EXPOSURE TO INCIDENT ULTRAVIOLET RADIATION CONSISTING ESSENTIALLY OF HOMOPOLYSTYRENE HAVING DISPERSED SUBSTANTIALLY UNIFORMLY THERETHROUGH A SUFFICIENT AMOUNT OF PROTECTIVE COMPOSITION COMPRISING A FIRST COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
38 words
A POLYSTYRENE COMPOSITION PROTECTED FROM DEVELOPING EXCESSIVE YELLOW COLORATION ON EXTEND EXPOSURE TO INCIDENT ULTRAVIOLET RADIATION CONSISTING ESSENTIALLY OF HOMOPOLYSTYRENE HAVING DISPERSED SUBSTANTIALLY UNIFORMLY THERETHROUGH A SUFFICIENT AMOUNT OF PROTECTIVE COMPOSITION COMPRISING A FIRST COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2984648A
Cited
US3008995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |