US1850774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direction finder
Assignee: PERRYMAN ELECTRIC CO Inc
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Filing: 1929-11-02
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Granted: 1932-03-22
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Expires: 1949-11-02
Abstract
No abstract record available.
Inventors
- 👤 Schwerin Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:17
CPC Classifications
G; G01; G01C; G01C17/00; G01C17/02; G01C17/28
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) | 1935-03-22 | 1935-09-21 | 1936-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-03-22 | 1939-09-21 | 1940-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-03-22 | 1943-09-21 | 1944-03-22 | $7700.00 | Window Closed / Lapsed |