Patent US525697A successfully refreshed from Google Patents.
Patent US2915531A successfully refreshed from Google Patents.
US2915531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 3-methyl-3, 5-dihydroxypentanoic acid and the delta-lactone thereof
Assignee: Merck and Co Inc
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Filing: 1956-07-12
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Granted: 1959-12-01
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Expires: 1976-07-12
Abstract
No abstract record available.
Inventors
- 👤 Donald E Wolf
- 👤 Carl H Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:13
CPC Classifications
C; C12; C12N; C12N1/00; C12N1/38; C07; C07C; C07C51/00; C07C51/09; C07C51/41; C07C51/412; C07C59/00; C07C59/01; C07C59/10; C07C59/105; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/853; Y10S435/854
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR THE PREPARATION OF 3-METHYL-3,5-DIHYDROXYPENTANOIC ACID AND B-METHYL-B-HYDROXY-8-VALEROLACTONE WHICH COMPRISES PARTIALLY REDUCING A LOWER ALKYL DIESTER OF B-METHYL-B-HYDROXYGLUTARIC ACID WITH SUBSTANTIALLY LESS THAN ONE MOLE OF LITHIUM ALUMINUM HYDRIDE PER MOLE OF THE DIESTER AT A TEMPERATURE BELOW ABOUT 0* C. TO PRODUCE A LOWER ALKYL MONOESTER OF 3-METHYL-3,5DIHYDROXYPENTANOIC ACID AND HYDROLYZING SAID MONOESTER TO THE DESIRED ACID AND LACTONE.
Claim 2
Dependent Claim
62 words
A PROCESS FOR THE PREPARATION OF 3-METHYL-3,5-DIHYDROXYPENTANOIC ACID AND B-METHYL-B-HYDROXY-8-VALEROLACTONE WHICH COMPRISES PARTIALLY REDUCING A LOWER ALKYL DIESTER OF B-METHYL-B-HYDROXYGLUTARIC ACID WITH SUBSTANTIALLY LESS THAN ONE MOLE OF LITHIUM ALUMINUM HYDRIDE PER MOLE OF THE DIESTER AT A TEMPERATURE BELOW ABOUT 0* C. TO PRODUCE A LOWER ALKYL MONOESTER OF 3-METHYL-3,5DIHYDROXYPENTANOIC ACID AND HYDROLYZING SAID MONOESTER TO THE DESIRED ACID AND LACTONE.
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) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |