US2422172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostable catalysts for the dehydrogenation of hydrocarbons
Assignee: Shell Development Co
•
Filing: 1942-07-28
•
Granted: 1947-06-10
•
Expires: 1962-07-28
Abstract
No abstract record available.
Inventors
- 👤 Albert E Smith
- 👤 Otto A Beeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:05
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/02; B01J21/00; B01J21/16; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
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) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |