US2856540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared detection apparatus
Assignee: General Electric Co
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Filing: 1954-12-30
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Granted: 1958-10-14
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Expires: 1974-12-30
Abstract
No abstract record available.
Inventors
- 👤 Howard D Warshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:28
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/02; G01J1/04; B; B61; B61K; B61K9/00; B61K9/04; B61K9/06; B61L; B61L1/00; B61L1/20; G01J5/00; G01J5/02; G01J5/08; G01J5/0801; G01J5/0802; G01J5/0806; G01S; G01S11/00; G01S11/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
IN AN APPARATUS FOR DETECTING INFRARED RADIATION FROM AN OBJECT AGAINST A BACKGROUND OF EXTRANEOUS FOREIGN RADIATION, THE COMBINATION COMPRISING A DETECTOR, AN ARSENIC TRISULFIDE LENS FOR FOCUSING SAID RADIATION ON SAID DETECTOR AND PASSING RADIATION HAVING WAVE LENGTHS OF LESS THAN 13 MICRONS, A SILICON MONOXIDE COATING ON SAID LENS FOR REMOVING FROM SAID RADIATION THAT RADIATION HAVING WAVE LENGTHS BETWEEN 9 AND 11 MICRONS, AND A SILVER CHLORIDE FILTER LOCATED BETWEEN SAID OBJECT AND SAID DETECTOR IN THE PATH OF SAID RADIATION FOR REMOVING THEREFROM THAT RADIATION HAVING WAVE LENGTHS LESS THAN 5 MICRONS WHEREBY SAID DETECTOR IS SUBSTANTIALLY INSENSITIVE TO SAID EXTRANEOUS RADIATION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |