Patent US2917732A successfully refreshed from Google Patents.
US2917732A
Expired / Lapsed
US
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Detector for indicating presence of objects
Assignee: Librascope Inc
•
Filing: 1957-03-22
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Granted: 1959-12-15
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Expires: 1977-03-22
Abstract
No abstract record available.
Inventors
- 👤 Wallace P Chase
- 👤 Davis William Robert
- 👤 Snyder John Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:29
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/101; G01V3/102; G08; G08G; G08G1/00; G08G1/01; G08G1/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2488815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |