US1797384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking mechanism for freight-car doors
Assignee: Individual
•
Filing: 1928-09-29
•
Granted: 1931-03-24
•
Expires: 1948-09-29
Abstract
No abstract record available.
Inventors
- 👤 John P Ward
- 👤 Robert E Hyde
- 👤 Harry J Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:14
CPC Classifications
B; B61; B61D; B61D19/00; B61D19/001; Y; Y10; Y10S; Y10S70/00; Y10S70/48; Y10T; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5173; Y10T70/5177; Y10T70/5181; Y10T70/70; Y10T70/7051; Y10T70/7062; Y10T70/7124
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) | 1934-03-23 | 1934-09-22 | 1935-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-03-23 | 1938-09-22 | 1939-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-03-23 | 1942-09-22 | 1943-03-24 | $7700.00 | Window Closed / Lapsed |