Patent US2698332A successfully refreshed from Google Patents.
US2698332A
Expired / Lapsed
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Aspirin derivative and method of making
Assignee: Reheis Co Inc
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Filing: 1951-04-20
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Granted: 1954-12-28
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Expires: 1971-04-20
Abstract
No abstract record available.
Inventors
- 👤 Stewart M Beekman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:34
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN MAKING AN ASPIRIN DERIVATIVE OF PRONOUNCED ANTACID PROPERTIES, IN MANNER TO INTRODUCE AT LEAST TWO HYDROXYL GROUPS FOR EACH ACETYLSALICYLATE GROUP IN THE FINAL DERIVATIVE AND TO PREVENT DECOMPOSITION OF THE DERIVATIVE AS FORMED, THE METHOD WHICH COMPRISES FORMING AN AQUEOUS SUSPENSION OF ACID REACTIVE HYDROUS ALUMINA GEL AND ACETYLSALICYLIC ACID IN PROPORTION NOT EXCEEDING ABOUT 1 MOL OF THE SAID ACID FOR 1 ATOM OF ALUMINUM IN THE GEL, VIGOROUSLY AGITATING THE RESULTING SUSPENSION, SO AS TO EFFECT FREQUENT CONTACT AND REACTION OF THE SUSPENDED GEL AND ACETYLSALICYLIC ACID, CONTINUING THE CONTACT OF THE SAID GEL AND ACID UNTIL THE PH OF THE RESULTING MIXTURE BECOMES SUBSTANTIALLY CONSTANT, AND THEN SEPARATING THE INSOLUBLE DERIVATIVE SO PRODUCED FROM THE REMAINING LIQUID PHASE.
Claim 2
Dependent Claim
123 words
IN MAKING AN ASPIRIN DERIVATIVE OF PRONOUNCED ANTACID PROPERTIES, IN MANNER TO INTRODUCE AT LEAST TWO HYDROXYL GROUPS FOR EACH ACETYLSALICYLATE GROUP IN THE FINAL DERIVATIVE AND TO PREVENT DECOMPOSITION OF THE DERIVATIVE AS FORMED, THE METHOD WHICH COMPRISES FORMING AN AQUEOUS SUSPENSION OF ACID REACTIVE HYDROUS ALUMINA GEL AND ACETYLSALICYLIC ACID IN PROPORTION NOT EXCEEDING ABOUT 1 MOL OF THE SAID ACID FOR 1 ATOM OF ALUMINUM IN THE GEL, VIGOROUSLY AGITATING THE RESULTING SUSPENSION, SO AS TO EFFECT FREQUENT CONTACT AND REACTION OF THE SUSPENDED GEL AND ACETYLSALICYLIC ACID, CONTINUING THE CONTACT OF THE SAID GEL AND ACID UNTIL THE PH OF THE RESULTING MIXTURE BECOMES SUBSTANTIALLY CONSTANT, AND THEN SEPARATING THE INSOLUBLE DERIVATIVE SO PRODUCED FROM THE REMAINING LIQUID PHASE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |