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Patent US1491593A successfully refreshed from Google Patents.
US1491593A
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US
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Compass
Assignee: ERNEST W MARSHALL
•
Filing: 1919-09-24
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Granted: 1924-04-22
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Expires: 1939-09-24
Abstract
No abstract record available.
Inventors
- 👤 Einar B Eriksen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:54
CPC Classifications
G; G01; G01C; G01C17/00
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) | 1927-04-22 | 1927-10-22 | 1928-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-04-22 | 1931-10-22 | 1932-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-04-22 | 1935-10-22 | 1936-04-22 | $7700.00 | Window Closed / Lapsed |