US2430015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Utilization of powdered catalysts
Assignee: Shell Development Co
•
Filing: 1945-08-21
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Granted: 1947-11-04
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Expires: 1965-08-21
Abstract
No abstract record available.
Inventors
- 👤 John A Hatton
- 👤 Donald L Cleveland
- 👤 Norman E Peery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:02
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-03 | 1951-05-05 | 1951-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-03 | 1955-05-05 | 1955-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-03 | 1959-05-05 | 1959-11-04 | $7700.00 | Window Closed / Lapsed |