Patent US3117939A successfully refreshed from Google Patents.
US3117939A
Expired / Lapsed
US
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Hydrogenation catalysts
Assignee: Wesson Oil and Snowdrift Co Inc
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Filing: 1960-01-25
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Granted: 1964-01-14
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Expires: 1980-01-25
Abstract
No abstract record available.
Inventors
- 👤 Harvey D Royce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:47
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1268692A
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US1275405A
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US1335161A
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US1548872A
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US2357352A
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US2520440A
Cited
US2697066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-13 | 1967-07-15 | 1968-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-13 | 1971-07-15 | 1972-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-13 | 1975-07-15 | 1976-01-14 | $7700.00 | Window Closed / Lapsed |