Patent US3198752A successfully refreshed from Google Patents.
US3198752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing tungsten oxide catalyst and product thereof
Assignee: Imperial Chemical Industries Ltd
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Filing: 1961-12-19
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Granted: 1965-08-03
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Expires: 1981-12-19
Abstract
No abstract record available.
Inventors
- 👤 Bridger George Walter
- 👤 Lemin Peter Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:44
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/30; C; C07; C07C; C07C29/00; C07C29/03; C07C29/04; B01J37/00; B01J37/0009; B01J37/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
AN IMPROVED PROCESS FOR PRODUCING A CATALYST FOR THE LIQUID PHASE HYDRATION OF OLEFINES, WHICH COMPRISES PELLETING A COMPOSITION CONSISTING ESSENTIALLY OF TUNGSTIC ACID, DEHYDRATING THE RESULTING PELLETS TO A BOUND WATER CONTENT OF BETWEEN 0.2% AND 3% BY WEIGHT UNDER CONDITIONS SUCH THAT THEY SUFFER SUBSTANTIALLY NO THERMAL OR MECHANICAL SHOCK, AND THEREAFTER REDUCING THE PARTLY DEHYDRATED TUNGSTIC ACID TO A VALENCY STATE CORRESPONDING TO AN OXIDE OF TUNGSTEN HAVING A COMPOSITION IN THE RANGE WO3 TO WO2.5.
Claim 2
Dependent Claim
79 words
AN IMPROVED PROCESS FOR PRODUCING A CATALYST FOR THE LIQUID PHASE HYDRATION OF OLEFINES, WHICH COMPRISES PELLETING A COMPOSITION CONSISTING ESSENTIALLY OF TUNGSTIC ACID, DEHYDRATING THE RESULTING PELLETS TO A BOUND WATER CONTENT OF BETWEEN 0.2% AND 3% BY WEIGHT UNDER CONDITIONS SUCH THAT THEY SUFFER SUBSTANTIALLY NO THERMAL OR MECHANICAL SHOCK, AND THEREAFTER REDUCING THE PARTLY DEHYDRATED TUNGSTIC ACID TO A VALENCY STATE CORRESPONDING TO AN OXIDE OF TUNGSTEN HAVING A COMPOSITION IN THE RANGE WO3 TO WO2.5.
Claim 3
Dependent Claim
85 words
A PELLETED CATALYST CONSISTING ESSENTIALLY OF TUNGSTEN OXIDE HAVING A REDUCED TENDENCY TO UNDERGO DISINTEGRATION DURING USE, SAID COMPOSITION BEING MADE BY PELLETING A COMPOSITION CONSISTING ESSENTIALLY OF TUNGSTIC ACID, DEHYDRATING THE RESULTING PELLETS TO A BOUND WATER CONTENT OF BETWEEN 0.2% AND 3% BY WEIGHT UNDER CONDITIONS SUCH THAT THEY SUFFER SUBSTANTIALLY NO THERMAL OR MECHANICAL SHOCK, AND THEREAFTER REDUCING THE PARTLY DEHYDRATED TUNGSTIC ACID TO A VALENCY STATE CORRESPONDING TO AN OXIDE OF TUNGSTEN HAVING A COMPOSITION IN THE RANGE WO3 TO WO2.5.
Claim 4
Dependent Claim
85 words
A PELLETED CATALYST CONSISTING ESSENTIALLY OF TUNGSTEN OXIDE HAVING A REDUCED TENDENCY TO UNDERGO DISINTEGRATION DURING USE, SAID COMPOSITION BEING MADE BY PELLETING A COMPOSITION CONSISTING ESSENTIALLY OF TUNGSTIC ACID, DEHYDRATING THE RESULTING PELLETS TO A BOUND WATER CONTENT OF BETWEEN 0.2% AND 3% BY WEIGHT UNDER CONDITIONS SUCH THAT THEY SUFFER SUBSTANTIALLY NO THERMAL OR MECHANICAL SHOCK, AND THEREAFTER REDUCING THE PARTLY DEHYDRATED TUNGSTIC ACID TO A VALENCY STATE CORRESPONDING TO AN OXIDE OF TUNGSTEN HAVING A COMPOSITION IN THE RANGE WO3 TO WO2.5.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |