Patent US2431612A successfully refreshed from Google Patents.
US2431612A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1945-05-04
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Granted: 1947-11-25
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Expires: 1965-05-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas C Furnas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:33
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/20; G01C21/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1199942A
Cited
US1801450A
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US1947668A
Cited
US1904347A
Cited
US2090270A
Cited
US2121061A
Cited
US2159614A
Cited
US2186330A
Cited
US2181134A
Cited
US2348535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-24 | 1951-05-26 | 1951-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-24 | 1955-05-26 | 1955-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-24 | 1959-05-26 | 1959-11-25 | $7700.00 | Window Closed / Lapsed |