US1431301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of extending the catalytic activity of mercury compounds
Assignee: Individual
•
Filing: 1919-05-21
•
Granted: 1922-10-10
•
Expires: 1939-05-21
Abstract
No abstract record available.
Inventors
- 👤 Grunstein Nathan
- 👤 Berge Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:28
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/087
Claims Analysis
Total Claims: 0
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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) | 1925-10-09 | 1926-04-10 | 1926-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-10-09 | 1930-04-10 | 1930-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-10-09 | 1934-04-10 | 1934-10-10 | $7700.00 | Window Closed / Lapsed |