Patent US2077924A successfully refreshed from Google Patents.
US2077924A
Expired / Lapsed
US
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Control
Assignee: Engineering & Res Corp
•
Filing: 1930-04-08
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Granted: 1937-04-20
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Expires: 1950-04-08
Abstract
No abstract record available.
Inventors
- 👤 Charles D Geer
- 👤 John L Biach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:01
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/01; G08G1/02
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) | 1940-04-19 | 1940-10-19 | 1941-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-04-19 | 1944-10-19 | 1945-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-04-19 | 1948-10-19 | 1949-04-20 | $7700.00 | Window Closed / Lapsed |