US2451804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for contacting solids and gases
Assignee: Standard Oil Development Co
•
Filing: 1940-12-27
•
Granted: 1948-10-19
•
Expires: 1960-12-27
Abstract
No abstract record available.
Inventors
- 👤 Donald L Campbell
- 👤 Homer Z Martin
- 👤 Eger V Murphree
- 👤 Charles W Tyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:30
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18
Claims Analysis
Total Claims: 0
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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) | 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 |