US3131025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc sulfide optical element
Assignee: Eastman Kodak Co
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Filing: 1959-10-29
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Granted: 1964-04-28
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Expires: 1979-10-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward Carnall
- 👤 Paul B Mauer
- 👤 William F Parsons
- 👤 Donald W Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/547; C03; C03B; C03B19/00; C03B19/06; C04B35/622; C04B35/64; C04B35/645; G; G02; G02B; G02B1/00; G02B1/02; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/268
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A TRANSPARENT ARTICLE CONSISTING OF COMPOSITE ZINC SULFIDE PARTICLES OF NOT MORE THAN 5 MICRONS SIZE FORMED BY HOT PRESSING THE PARTICLES INTO A UNITARY POLYCRYSTALLINE HOMOGENEOUS SOLID OF AT LEAST 99% OF THEORETICAL DENSITY.
Claim 2
Dependent Claim
35 words
A TRANSPARENT ARTICLE CONSISTING OF COMPOSITE ZINC SULFIDE PARTICLES OF NOT MORE THAN 5 MICRONS SIZE FORMED BY HOT PRESSING THE PARTICLES INTO A UNITARY POLYCRYSTALLINE HOMOGENEOUS SOLID OF AT LEAST 99% OF THEORETICAL DENSITY.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |