US2981913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective infra-red detectors
Assignee: Barnes Engineering Co
•
Filing: 1957-02-25
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Granted: 1961-04-25
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Robert B Barnes
- 👤 Eric M Wormser
- 👤 Waard Russell D De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:47
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/60; G01J5/602
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2423476A
Cited
US2562538A
Cited
US2658390A
Cited
US2587674A
Cited
GB744914A
Cited
US2768265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |