US2801188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated gelating light filter
Assignee: Eastman Kodak Co
•
Filing: 1955-03-17
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Granted: 1957-07-30
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Expires: 1975-03-17
Abstract
No abstract record available.
Inventors
- 👤 Louis M Minsk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:43
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/04; G03C7/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/3175; Y10T428/31754
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
A GELATIN LIGHT FILTER COATED ON BOTH SIDES WITH A LACQUER COMPOSITON COMPRISING THE BENZYL ESTER LACTONE OF A VINYL ACETATE-MALEIC ANHYDRIDE INTERPOLYMER CONSISTING OF VINYL ACETATE AND MALEIC ANHYDRIDE, THE LACQUER RESULTING IN A COATING HAVING THE REFRACTIVE INDEX OF ABOUT 1.540
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) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |