US3409773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared image detector using cryogenic liquid
Assignee: Dow Chemical Co
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Filing: 1966-04-01
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Granted: 1968-11-05
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Expires: 1986-04-01
Abstract
No abstract record available.
Inventors
- 👤 Lyle B Borst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:06
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/12; H; H04; H04N; H04N23/00; H04N23/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
AN APPARATUS FOR DETECTING INFRARED OBJECTS WHICH COMPRISES A CONTAINER, SAID CONTAINER BEING CAPABLE OF MAINTAINING IN THE LIQUID STATE A CRYOGENIC LIQUID HAVING A BOILING POINT BELOW ABOUT 273*K., A PLATEN HAVING A BLACK SURFACE POSITIONED IN SAID CONTAINER, SAID BLACK SURFACE OF SAID PLATEN BEING COVERED WITH A THIN LAYER OF A CRYOGENIC LIQUID HAVING A BOILING POINT BELOW ABOUT 273* K., A LIGHT SOURCE POSITIONED SUCH THAT THE CRYOGENIC LIQUID FILM COVERING THE BLACK SURFACE OF SAID PLATEN IS ILLUMINATED, OBSERVING MEANS POSITIONED TO PICK UP LIGHT REFLECTED FROM THE SURFACE OF THE FILM ON SAID PLATEN, AND MEANS FOR FOCUSING AN INFRARED IMAGE FROM AN INFRARED SOURCE TO BE DETECTED ONTO SAID CRYOGENIC LIQUID FILM COVERING SAID BLACK SURFACE OF SAID PLATEN.
Claim 2
Independent Claim
126 words
AN APPARATUS FOR DETECTING INFRARED OBJECTS WHICH COMPRISES A CONTAINER, SAID CONTAINER BEING CAPABLE OF MAINTAINING IN THE LIQUID STATE A CRYOGENIC LIQUID HAVING A BOILING POINT BELOW ABOUT 273*K., A PLATEN HAVING A BLACK SURFACE POSITIONED IN SAID CONTAINER, SAID BLACK SURFACE OF SAID PLATEN BEING COVERED WITH A THIN LAYER OF A CRYOGENIC LIQUID HAVING A BOILING POINT BELOW ABOUT 273* K., A LIGHT SOURCE POSITIONED SUCH THAT THE CRYOGENIC LIQUID FILM COVERING THE BLACK SURFACE OF SAID PLATEN IS ILLUMINATED, OBSERVING MEANS POSITIONED TO PICK UP LIGHT REFLECTED FROM THE SURFACE OF THE FILM ON SAID PLATEN, AND MEANS FOR FOCUSING AN INFRARED IMAGE FROM AN INFRARED SOURCE TO BE DETECTED ONTO SAID CRYOGENIC LIQUID FILM COVERING SAID BLACK SURFACE OF SAID PLATEN.
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) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |