US2495499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light filter transmitting infrared radiation and opaque to visible light
Assignee: Polaroid Corp
•
Filing: 1946-03-05
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Granted: 1950-01-24
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Expires: 1966-03-05
Abstract
No abstract record available.
Inventors
- 👤 Jr William F Amon
- 👤 Elkan R Blout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:35
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/223
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
AN OPTICAL FILTER SUBSTANTIALLY COMPLETELY BLOCKING ALL LIGHT IN THE VISIBLE SPECTRUM AND HAVING HIGH TRANSMISSION IN THE NEAR INFRARED AND COMPRISING A LAYER OF AT LEAST ONE POLYMERIC PLASTIC FROM THE CLASS CONSISTING OF POLYVINYL ALCOHOL, POLYVINYL ACETATE, POLYVINYL ACETAL AND POLYVINYL BUTYRAL, SAID LAYER COMPRISING DEHYDRATION PRODUCTS OF SAID PLASTIC HAVING CONJUGATED UNSATURATED SYSTEMS OF THE TYPE
Claim 2
Dependent Claim
59 words
AN OPTICAL FILTER SUBSTANTIALLY COMPLETELY BLOCKING ALL LIGHT IN THE VISIBLE SPECTRUM AND HAVING HIGH TRANSMISSION IN THE NEAR INFRARED AND COMPRISING A LAYER OF AT LEAST ONE POLYMERIC PLASTIC FROM THE CLASS CONSISTING OF POLYVINYL ALCOHOL, POLYVINYL ACETATE, POLYVINYL ACETAL AND POLYVINYL BUTYRAL, SAID LAYER COMPRISING DEHYDRATION PRODUCTS OF SAID PLASTIC HAVING CONJUGATED UNSATURATED SYSTEMS OF THE TYPE
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) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |