Patent US3861269A successfully refreshed from Google Patents.
US2986527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared transmitting optical filter
Assignee: Union Carbide Corp
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Filing: 1957-07-22
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Granted: 1961-05-30
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Expires: 1977-07-22
Abstract
No abstract record available.
Inventors
- 👤 Redfield David
- 👤 Ruth L Baum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:12
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
AN OPTICAL FILTER CAPABLE OF SELECTIVELY TRANSMITTING INFRARED RADIATION OF 9 TO 12 MICRONS WAVE LENGTH, SAID FILTER BEING COMPOSED OF BORON NITRIDE POWDER IN MATRIX OF A COMPRESSED, POWDERED MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON, GERMANIUM, INDIUM ANTIMONIDE, ZINC SULFIDE, CADMIUM SULFIDE AND THALLIUM HALIDE, SAID MATERIAL BEING TRANSPARENT TO INFRARED AND HAVING AN INFRARED INDEX OF REFRACTION IN THE RANGE 2 TO 5, WHICH MATERIAL IS MECHANICALLY AND OPTICALLY STABLE AT TEMPERATURES UP TO AT LEAST 300*C., SAID BORON NITRIDE BEING PRESENT IN A PROPORTION OF 0.5% TO 5% BY VOLUME IN SAID FILTER.
Claim 2
Dependent Claim
98 words
AN OPTICAL FILTER CAPABLE OF SELECTIVELY TRANSMITTING INFRARED RADIATION OF 9 TO 12 MICRONS WAVE LENGTH, SAID FILTER BEING COMPOSED OF BORON NITRIDE POWDER IN MATRIX OF A COMPRESSED, POWDERED MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON, GERMANIUM, INDIUM ANTIMONIDE, ZINC SULFIDE, CADMIUM SULFIDE AND THALLIUM HALIDE, SAID MATERIAL BEING TRANSPARENT TO INFRARED AND HAVING AN INFRARED INDEX OF REFRACTION IN THE RANGE 2 TO 5, WHICH MATERIAL IS MECHANICALLY AND OPTICALLY STABLE AT TEMPERATURES UP TO AT LEAST 300*C., SAID BORON NITRIDE BEING PRESENT IN A PROPORTION OF 0.5% TO 5% BY VOLUME IN SAID FILTER.
References Cited (Backward Citations)
US2547173A
Cited
US2671154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |