US3589880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plurality optical element pressing process
Assignee: Eastman Kodak Co
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Filing: 1970-03-24
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Granted: 1971-06-29
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Expires: 1990-03-24
Abstract
Abstract THE INVENTION RELATES TO HOT PRESSING OF A PLURALITY OF OPTICAL ELEMENTS OF MAGNESIUM FLUORIDE, ZINC SULFIDE, CALCIUM FLUORIDE, ZINC SELENIDE, MAGNESIUM OXIDE, CADMIUM TELLURIDE, LANTHANUM FLUORIDE, CADMIUM SULFIED, ZINC OXIDE, STRONTIUM FLUORIDE, TITANIUM DIOXIDE, AND CADMIUM SELENIDE, BY PRELIMINARY PREPARING THE INDIVIDUAL ELEMENTS, APPLYING A PARTING LAYER TO EACH ELEMENT, STACKING THE INDIVIDUAL ELEMENTS FOR PLURAL HOT FUSION PRESSING TO THE RESULTANT OPTICAL ELEMENTS AS TO PREVENT SHIFTING OF THE INDIVIDUAL ELEMENTS DURING FINAL FUSION PRESSING.
Inventors
- 👤 Richard E Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:50
CPC Classifications
C; C03; C03B; C03B40/00; C03B40/02; C03B40/033; C04; C04B; C04B35/00; C04B35/515; C04B35/547; C04B35/622; C04B35/64; C04B35/645; G; G02; G02B; G02B1/00; G02B1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |