Patent US1774558A successfully refreshed from Google Patents.
US1774558A
Expired / Lapsed
US
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Duplex-operating device
Assignee: Bendix Brake Co
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Filing: 1928-04-26
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Granted: 1930-09-02
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Expires: 1948-04-26
Abstract
No abstract record available.
Inventors
- 👤 Isaac M Laddon
- 👤 William A Ring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:10
CPC Classifications
B; B64; B64C; B64C25/00; B64C25/32; B64C25/42; B64C25/44
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) | 1933-09-01 | 1934-03-03 | 1934-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-09-01 | 1938-03-03 | 1938-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-09-01 | 1942-03-03 | 1942-09-02 | $7700.00 | Window Closed / Lapsed |