Patent US3917672A successfully refreshed from Google Patents.
US3917672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxybenzoylalkanoic acid esters
Assignee: Novartis Corp
•
Filing: 1973-08-06
•
Granted: 1975-11-04
•
Expires: 1993-08-06
Abstract
Abstract Esters of hydroxybenzoylcarboxylic acid are new stabilizers for organic materials. They are prepared by reacting a corresponding acid with an alkohol in the presence of a catalyst.
Inventors
- 👤 Andreas Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:25
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C09K15/06; C09K15/08; C07; C07C; C07C323/00; C07C59/00; C07C59/40; C07C59/76; C07C59/90; C07C62/00; C07C62/30; C07C62/38; C07D; C07D339/00; C07D339/02; C07D339/06; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
118 words
A compound of claim 1 of the formula I, in which R1 and R2 independently of one another are a primary or secondary alkyl group with 1-4 carbon atoms, R3 is hydrogen, X is a straight-chain, branched or cyclic alkyl group with 1-18 carbon atoms, aralkyl with 7-9 carbon atoms, thiaalkyl with 3-20 carbon atoms, with the oxygen of the carboxyl group being bonded to a carbon atom in the thiaalkyl which does not carry any further hetero-atoms, alkylene with 2-18 carbon atoms, or thiaalkylene with 4-18 carbon atoms, with the oxygen of the carboxyl group being bonded to a carbon atom in the thiaalkylene which does not carry any further hetero-atoms, and n is 1 or 2.
Claim 4
Dependent Claim
64 words
A compound of claim 1 of the formula I, in which R1 and R2 are a primary or secondary alkyl group with 1-4 carbon atoms, R3 is hydrogen, X is a straight-chain, branched or cyclic alkyl group with 1 to 18 carbon atoms, thiaalkyl with 4 to 14 carbon atoms or alkylene with 5 or 6 carbon atoms and n is 1 or 2.
Claim 5
Dependent Claim
8 words
Compound according to claim 1, of the formula
Claim 6
Dependent Claim
8 words
Compound according to claim 1, of the formula
Claim 7
Dependent Claim
8 words
Compound according to claim 1, of the formula
References Cited (Backward Citations)
US3515731A
Cited
US3549663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |