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Patent US2681374A successfully refreshed from Google Patents.
US2681374A
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Control of catalyst hydration
Assignee: Standard Oil Development Co
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Filing: 1951-04-14
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Granted: 1954-06-15
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Expires: 1971-04-14
Abstract
No abstract record available.
Inventors
- 👤 Sam R Bethea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:43
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/14; C07C2/18; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
IN A CATALYTIC CONVERSION PROCESS IN WHICH A WET OLEFINIC HYDROCARBON FEED IN VAPOROUS CONDITION IS CONTACTED IN A REACTION ZONE WITH A LIQUID PHOSPHORIC ACID CATALYST HAVING A STRENGTH NO LESS THAN 75% H3PO4 TO FORM A POLYMER, THE METHOD OF MAINTAINING THE ACID STRENGTH OF THE CATALYST WHICH COMPRISES CONTACTING THE SAID
Claim 2
Dependent Claim
54 words
IN A CATALYTIC CONVERSION PROCESS IN WHICH A WET OLEFINIC HYDROCARBON FEED IN VAPOROUS CONDITION IS CONTACTED IN A REACTION ZONE WITH A LIQUID PHOSPHORIC ACID CATALYST HAVING A STRENGTH NO LESS THAN 75% H3PO4 TO FORM A POLYMER, THE METHOD OF MAINTAINING THE ACID STRENGTH OF THE CATALYST WHICH COMPRISES CONTACTING THE SAID
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) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |