US3144467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparation of alkylated dihydrocoumarins
Assignee: Universal Oil Products Co
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Filing: 1962-07-16
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Granted: 1964-08-11
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Expires: 1982-07-16
Abstract
No abstract record available.
Inventors
- 👤 William J Houlihan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:35
CPC Classifications
C; C11; C11B; C11B9/00; C11B9/0069; C11B9/0073; C11B9/008; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/06; C07D311/20; C07D311/78; C07D311/92; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR THE PREPARATION OF A POLYALKYLATED DIHYDROCOUMARIN WHICH COMPRISES CONDENSING A DIHYDROCOUMARIN WITH AN ALKYLATING AGENT SELECTED FROM THE GROUP CONSISTING OF OLEFINS, MONO-OLS, DIOS AND ETHERS AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 0* TO ABOUT 80* C. IN THE PRESENCE OF AN ACID ALKYLATION CATALYST SELECTED FROM THE GROUP CONSISTING OF SULFURIC, PHOSPHORIC, CHLOROSULFONIC, ALKYL SULFONIC AND ALKYL PHOSPHONIC ACIDS, AND RECOVERING THE RESULTANT POLYALKYLATED DIHYDROCOUMARIN.
Claim 2
Dependent Claim
72 words
A PROCESS FOR THE PREPARATION OF A POLYALKYLATED DIHYDROCOUMARIN WHICH COMPRISES CONDENSING A DIHYDROCOUMARIN WITH AN ALKYLATING AGENT SELECTED FROM THE GROUP CONSISTING OF OLEFINS, MONO-OLS, DIOS AND ETHERS AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 0* TO ABOUT 80* C. IN THE PRESENCE OF AN ACID ALKYLATION CATALYST SELECTED FROM THE GROUP CONSISTING OF SULFURIC, PHOSPHORIC, CHLOROSULFONIC, ALKYL SULFONIC AND ALKYL PHOSPHONIC ACIDS, AND RECOVERING THE RESULTANT POLYALKYLATED DIHYDROCOUMARIN.
References Cited (Backward Citations)
US2542965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |