US3398281A
Expired / Lapsed
US
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Direct reading, wavelength independent radiometer employing a pyroelectric crystal detector
Assignee: CHARLES F KETTERING FOUNDATION
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Filing: 1966-12-27
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Granted: 1968-08-20
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Expires: 1986-12-27
Abstract
No abstract record available.
Inventors
- 👤 Richard W Treharne
- 👤 Charlton K Mckibben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:20
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/10; G01J5/34; H; H03; H03F; H03F3/00; H03F3/38; H03F3/387; H03F3/393
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |