US1801784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for producing photographic silver-salt emulsions
Assignee: Individual
•
Filing: 1929-12-04
•
Granted: 1931-04-21
•
Expires: 1949-12-04
Abstract
No abstract record available.
Inventors
- 👤 Schwarz Georg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:02
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0008; B01J13/0017
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) | 1934-04-20 | 1934-10-20 | 1935-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-04-20 | 1938-10-20 | 1939-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-04-20 | 1942-10-20 | 1943-04-21 | $7700.00 | Window Closed / Lapsed |