Patent US2023011A successfully refreshed from Google Patents.
US2270165A
Expired / Lapsed
US
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Catalyst
Assignee: Shell Development Co
•
Filing: 1937-12-29
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Granted: 1942-01-13
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Expires: 1957-12-29
Abstract
No abstract record available.
Inventors
- 👤 Herbert P A Groll
- 👤 Burgin James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:11
CPC Classifications
C; C07; C07B; C07B61/00; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C10; C10G; C10G45/00; C10G45/02; C10G45/04; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901; Y10S585/906
Claims Analysis
Total Claims: 0
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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) | 1945-01-12 | 1945-07-14 | 1946-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-12 | 1949-07-14 | 1950-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-12 | 1953-07-14 | 1954-01-13 | $7700.00 | Window Closed / Lapsed |