US1674781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making diaphragms
Assignee: Westinghouse Air Brake Co
•
Filing: 1927-06-20
•
Granted: 1928-06-26
•
Expires: 1947-06-20
Abstract
No abstract record available.
Inventors
- 👤 Cecil S Kelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:36
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/34; B29C70/347; B29C70/06; B29C70/10; B29C70/16; B29C70/20; B29C2791/00; B29C2791/001; B29K; B29K2021/00; B29L; B29L2031/00; B29L2031/755; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043
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) | 1931-06-26 | 1931-12-26 | 1932-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-06-26 | 1935-12-26 | 1936-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-06-26 | 1939-12-26 | 1940-06-26 | $7700.00 | Window Closed / Lapsed |