Patent US2451803A successfully refreshed from Google Patents.
US2451803A
Expired / Lapsed
US
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Method of contacting solids and gases
Assignee: Standard Oil Development Co
•
Filing: 1940-10-05
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Granted: 1948-10-19
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Expires: 1960-10-05
Abstract
No abstract record available.
Inventors
- 👤 Donald L Campbell
- 👤 Homer Z Martin
- 👤 Charles W Tyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:03
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191023045A
Cited
US2039904A
Cited
DE533037C
Cited
US1984380A
Cited
US2231424A
Cited
US2264438A
Cited
US2304827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |