US4104477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ester derivatives
Assignee: Chevron USA Inc
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Filing: 1977-01-11
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Granted: 1978-08-01
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Expires: 1997-01-11
Abstract
Abstract Spirodilactones from alkenyl or alkyl bis(succinic anhydride) and acids and alkyl esters thereof.
Inventors
- 👤 Joe B. Lavigne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:39
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/10; C07C; C07C57/00; C07C57/02; C07C57/13; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
Cyclic keto esters or acids of spirodilactones from alkenyl bis(succinic anhydride) having the formula ##STR5## in which R is alkenyl of 2 to 28 carbon atoms and R' groups, which may be the same or different, are hydrogen or alkyl groups of 1 to 8 carbon atoms each.
Claim 2
Dependent Claim
48 words
Cyclic keto esters or acids of spirodilactones from alkenyl bis(succinic anhydride) having the formula ##STR5## in which R is alkenyl of 2 to 28 carbon atoms and R' groups, which may be the same or different, are hydrogen or alkyl groups of 1 to 8 carbon atoms each.
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) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |