Patent US2920209A successfully refreshed from Google Patents.
US2920209A
Expired / Lapsed
US
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Photoelectric device
Assignee: Melpar Inc
•
Filing: 1957-09-25
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Granted: 1960-01-05
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Expires: 1977-09-25
Abstract
No abstract record available.
Inventors
- 👤 William P Asten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:39
CPC Classifications
G; G01; G01V; G01V8/00; G01V8/10; G01V8/12; G01V8/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1601513A
Cited
US2078800A
Cited
US2420716A
Cited
US2688099A
Cited
US2702494A
Cited
DE892429C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |