US3663596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aliphatic esters of 3,5-di-alkyl salicylic acids useful as uv stabilizers for thermoplastics
Assignee: Shell USA Inc
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Filing: 1970-08-10
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Granted: 1972-05-16
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Expires: 1990-08-10
Abstract
Abstract THERMOPLASTIC COMPOSITIONS COMPRISE AS STABILIZERS AGAINST ACTINIC RADIATION CERTAIN ESTERS OF MONO- OR POLYVALENT SATURATED NON-AROMATIC ALCOHOLS WITH CERTAIN 2-HYDROXYBENZOIC ACIDS HAVING AN ALKYL OR ALKOXY SUBSTITUTED IN THE RING IN THE 3-POSITION, THE 5-POSITION, OR BOTH.
Inventors
- 👤 Hans A Gersmann
- 👤 Hendricus A Oosterhof
- 👤 Aart Strang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:27
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/134; C08K5/1345; Y; Y10; Y10S; Y10S524/00; Y10S524/925; Y10S524/929
Claims Analysis
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |