US3402226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of hot pressing magnesium oxide infrared transmitting optical elements
Assignee: Eastman Kodak Co
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Filing: 1965-09-15
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Granted: 1968-09-17
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Expires: 1985-09-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward Carnall
- 👤 Sherley E Hatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:08
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/32; C04B33/326; G; G02; G02B; G02B1/00; G02B1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
THE METHOD OF FORMING A HOMOGENEOUS SOLID OF MOLDED MAGNESIUM OXIDE HAVING A DENSITY IN THE RANGE OF FROM 99% UP TO AND INCLUDING THEORETICAL DENSITY WHICH COMPRISES MOLDING MAGNESIUM OXIDE POWDER IN AN INERT ATMOSPHERE UNDER A PRESSURE WITHIN THE RANGE OF FROM 40,000 TO 65,000 POUNDS PER SQUARE INCH AND AT A TEMPERATURE WITHIN THE RANGE OF 800*C. TO 860*C.
Claim 2
Independent Claim
62 words
THE METHOD OF FORMING A HOMOGENEOUS SOLID OF MOLDED MAGNESIUM OXIDE HAVING A DENSITY IN THE RANGE OF FROM 99% UP TO AND INCLUDING THEORETICAL DENSITY WHICH COMPRISES MOLDING MAGNESIUM OXIDE POWDER IN AN INERT ATMOSPHERE UNDER A PRESSURE WITHIN THE RANGE OF FROM 40,000 TO 65,000 POUNDS PER SQUARE INCH AND AT A TEMPERATURE WITHIN THE RANGE OF 800*C. TO 860*C.
References Cited (Backward Citations)
US2091569A
Cited
US3141782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |