US3007940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing derivatives of 3, 3-pentamethylene-4-hydroxybutyric acid
Assignee: Warner Lambert Co LLC
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Filing: 1960-03-01
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Granted: 1961-11-07
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Expires: 1980-03-01
Abstract
No abstract record available.
Inventors
- 👤 Jr John Shavel
- 👤 Robert I Meltzer
- 👤 Vigelius Wolf-Dieter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:10
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/94
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
A METHOD OF PREPARING DERIVATTIVES OF 3,3-PENTAMETHYLENE-4-HYDROXYBUTYRIC ACID WHICH COMPRISES CONVERTING CYCLOHEXANEDIACETUC ACID TO CYCLOHEXANEDIACETIC ANHYDRIDE, REACTING SAID ANHYDRIDE WITH A LOWER ALKYL ALCOHOL TO FORM A MONO-LOWER ALKYL ESTER OF CYCLOHEXANEDIACETIC ACID, CONVERTING SAID ESTER TO ITS SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF SILVER, POTASSIUM AND BIVALENT MERCURY, REACTING SAID METAL SALT WITH A HALOGEN SELECTED FROM THE GROUP CONSISTING OF BROMINE AND IODINE TO FORM THE CORRESPONDING LOWER ALKYL 3,3-PENTAMETHYLENE-4-HALOBUTYRATE AND REACTING SAID SUBSTITUTED 4-HALOBUTYRATE WITH A BASE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE.
Claim 2
Independent Claim
95 words
A METHOD OF PREPARING DERIVATTIVES OF 3,3-PENTAMETHYLENE-4-HYDROXYBUTYRIC ACID WHICH COMPRISES CONVERTING CYCLOHEXANEDIACETUC ACID TO CYCLOHEXANEDIACETIC ANHYDRIDE, REACTING SAID ANHYDRIDE WITH A LOWER ALKYL ALCOHOL TO FORM A MONO-LOWER ALKYL ESTER OF CYCLOHEXANEDIACETIC ACID, CONVERTING SAID ESTER TO ITS SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF SILVER, POTASSIUM AND BIVALENT MERCURY, REACTING SAID METAL SALT WITH A HALOGEN SELECTED FROM THE GROUP CONSISTING OF BROMINE AND IODINE TO FORM THE CORRESPONDING LOWER ALKYL 3,3-PENTAMETHYLENE-4-HALOBUTYRATE AND REACTING SAID SUBSTITUTED 4-HALOBUTYRATE WITH A BASE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE.
Claim 3
Dependent Claim
22 words
A METHOD ACCORDING TO CLAIM 1 WHEREIN THE REACTION PRODUCT OF SAID SUBSTITUTED 4-HALOBUTYRATE WITH SAID BASE IS ACIDIFIED TO FORM B,B-PENTAMETHYLENEBUTYROLACTONE.
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) | 1964-11-06 | 1965-05-08 | 1965-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-06 | 1969-05-08 | 1969-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-06 | 1973-05-08 | 1973-11-07 | $7700.00 | Window Closed / Lapsed |