US2991286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homodihydrocarbostyril
Assignee: Beazer East Inc
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Filing: 1959-10-07
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Granted: 1961-07-04
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Expires: 1979-10-07
Abstract
No abstract record available.
Inventors
- 👤 Ben B Corson
- 👤 Louis H Schwartzman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:03
CPC Classifications
C; C07; C07D; C07D223/00; C07D223/14; C07D223/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A PROCESS FOR THE PRODUCTION OF HOMODIHYDROCARBOSTYRIL BY A BECKMANN REARRANGEMENT OF AN OXIME ALPHA-TETRALONE IN POLYPHOSPHORIC ACID, THE IMPROVEMENT WHICH COMPRISES ADDING SAID OXIME TO SAID ACID IN SMALL PORTIONS TO CONTROL THE HEAT EVOLVED BY THE EXOTHERMIC REACTION WHILE MAINTAINING THE TEMPERATURE AT ABOUT 80*C. AND IN SUCH QUANTITY THAT THE FINAL RATIO OF OXIME ADDED TO THE ACID IS ONE PART BY WEIGHT OF OXIME TO FORM TWO TO THREE PARTS OF ACID, MAINTAINING THE MIXTURE AT ABOUT 80*C. UNTIL REARRANGEMENT SUBSTANTIALLY OCCURS, COOLING THE REACTION MIXTURE TO ABOUT 30*C., ADDING ICE TO SAID MIXTURE TO PRECIPITATE THE HOMODIHYDYROCARBOSTRYIL, AND REMOVING THE PRECIPITATED HOMODIHYDROCARBOSTYRIL FROM THE LIQUID.
Claim 2
Dependent Claim
111 words
IN A PROCESS FOR THE PRODUCTION OF HOMODIHYDROCARBOSTYRIL BY A BECKMANN REARRANGEMENT OF AN OXIME ALPHA-TETRALONE IN POLYPHOSPHORIC ACID, THE IMPROVEMENT WHICH COMPRISES ADDING SAID OXIME TO SAID ACID IN SMALL PORTIONS TO CONTROL THE HEAT EVOLVED BY THE EXOTHERMIC REACTION WHILE MAINTAINING THE TEMPERATURE AT ABOUT 80*C. AND IN SUCH QUANTITY THAT THE FINAL RATIO OF OXIME ADDED TO THE ACID IS ONE PART BY WEIGHT OF OXIME TO FORM TWO TO THREE PARTS OF ACID, MAINTAINING THE MIXTURE AT ABOUT 80*C. UNTIL REARRANGEMENT SUBSTANTIALLY OCCURS, COOLING THE REACTION MIXTURE TO ABOUT 30*C., ADDING ICE TO SAID MIXTURE TO PRECIPITATE THE HOMODIHYDYROCARBOSTRYIL, AND REMOVING THE PRECIPITATED HOMODIHYDROCARBOSTYRIL FROM THE LIQUID.
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |