US2827489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of 2-diphenylacetyl-1, 3-indandione
Assignee: Pharmacia and Upjohn Co
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Filing: 1956-01-27
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Granted: 1958-03-18
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Expires: 1976-01-27
Abstract
No abstract record available.
Inventors
- 👤 Robert D Birkenmeyer
- 👤 Merrill E Speeter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:29
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/587; C07C49/657; C07C49/665; C07C49/67; C07C45/00; C07C45/45; C07C45/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR THE PREPARATION OF 2-DIPHENYLACETYL1,3-INDANDIONE WHICH COMPORISES THE STEPS OF HEATING A MIXTURE OF DIPHENYLACETONE AND AT LEAST A FIFTY PERCENT MOLAL EXCESS OF A DI(LOWER-ALKYL) PHTHALATE IN THE PRESENCE OF AN ALKALI-METAL ALKOXIDE AND BENZENE TO A TEMPERATURE BETWEEN 95 DEGREES AND ABOUT 150 DEGREES CENTIGRADE WHILST DISTILLING BENZENE AND THE ALKANOL PRODUCED DURING THE REACTION FROM THE REACTION ZONE, AND RECOVERING 2-DIPHENYLACETYL-1,3-INDANDIONE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
70 words
A PROCESS FOR THE PREPARATION OF 2-DIPHENYLACETYL1,3-INDANDIONE WHICH COMPORISES THE STEPS OF HEATING A MIXTURE OF DIPHENYLACETONE AND AT LEAST A FIFTY PERCENT MOLAL EXCESS OF A DI(LOWER-ALKYL) PHTHALATE IN THE PRESENCE OF AN ALKALI-METAL ALKOXIDE AND BENZENE TO A TEMPERATURE BETWEEN 95 DEGREES AND ABOUT 150 DEGREES CENTIGRADE WHILST DISTILLING BENZENE AND THE ALKANOL PRODUCED DURING THE REACTION FROM THE REACTION ZONE, AND RECOVERING 2-DIPHENYLACETYL-1,3-INDANDIONE FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2672483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |