US3523888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst withdrawal process
Assignee: Cities Service Research and Development Co
•
Filing: 1967-12-26
•
Granted: 1970-08-11
•
Expires: 1987-12-26
Abstract
No abstract record available.
Inventors
- 👤 Norman C Stewart
- 👤 Roger P Van Driesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:39
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/20; B01J8/22; B01J8/0015; B01J8/0035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3227528A
Cited
US3336217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |