US1997135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst and process of preparing same
Assignee: Individual
•
Filing: 1934-08-02
•
Granted: 1935-04-09
•
Expires: 1954-08-02
Abstract
No abstract record available.
Inventors
- 👤 Mahler Edouard Robert Willi De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:56
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; C; C07; C07B; C07B61/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-04-08 | 1938-10-08 | 1939-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-08 | 1942-10-08 | 1943-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-08 | 1946-10-08 | 1947-04-09 | $7700.00 | Window Closed / Lapsed |