US2624239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared band pass filter
Assignee: Polaroid Corp
•
Filing: 1949-03-02
•
Granted: 1953-01-06
•
Expires: 1969-03-02
Abstract
No abstract record available.
Inventors
- 👤 Elkan R Blout
- 👤 John E Campbell
- 👤 Richard S Corley
- 👤 Patricia L Snow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:31
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/223; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A BAND PASS FILTER FOR INFRARED RADIATION COMPRISING A SHEET COMPRISING PARTIALLY DEHYDROHALOGENATED MATERIAL FROM THE CLASS CONSISTING OF POLYVINYL CHLORIDE AND POLYVINYLIDENE CHLORIDE WHICH HAS BEEN IMBIBED IN A BATH COMPRISING A SWELLING AGENT, A CONVERSION AGENT AND A DILUENT AND THEREAFTER HEATED UNTIL THE CHLORINE CONTENT OF SAID MATERIAL HAS BEEN REDUCED BY FROM ONE-FIFTH TO ONE-THIRD, SAID SHEET BEING SUBSTANTIALLY COMPLETELY OPAQUE TO ALL RADIATION
Claim 2
Dependent Claim
68 words
A BAND PASS FILTER FOR INFRARED RADIATION COMPRISING A SHEET COMPRISING PARTIALLY DEHYDROHALOGENATED MATERIAL FROM THE CLASS CONSISTING OF POLYVINYL CHLORIDE AND POLYVINYLIDENE CHLORIDE WHICH HAS BEEN IMBIBED IN A BATH COMPRISING A SWELLING AGENT, A CONVERSION AGENT AND A DILUENT AND THEREAFTER HEATED UNTIL THE CHLORINE CONTENT OF SAID MATERIAL HAS BEEN REDUCED BY FROM ONE-FIFTH TO ONE-THIRD, SAID SHEET BEING SUBSTANTIALLY COMPLETELY OPAQUE TO ALL RADIATION
References Cited (Backward Citations)
US1627935A
Cited
US2099976A
Cited
GB419826A
Cited
US2426080A
Cited
US2408608A
Cited
US2446984A
Cited
US2495499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-06 | 1956-07-07 | 1957-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-06 | 1960-07-07 | 1961-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-06 | 1964-07-07 | 1965-01-06 | $7700.00 | Window Closed / Lapsed |