US3312759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making optical elements from ba or mg fluoride containing boron nitride
Assignee: Bausch and Lomb Inc
•
Filing: 1963-09-23
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Granted: 1967-04-04
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Expires: 1983-09-23
Abstract
No abstract record available.
Inventors
- 👤 Eugene C Letter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:17
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/02; C; C04; C04B; C04B35/00; C04B35/515
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A METHOD FOR MAKING AN INFRARED TRANSMITTING OPTICAL ELEMENT COMPRISING HOT PRESSING A PULVERULENT MASS OF AN ALKALINE EARTH FLUORIDE SELECTED FROM THE GROUP CONSISTING OF BARIUM FLUORIDE AND MAGNESIUM FLUORIDE TOGETHER WITH BORON NITRIDE AT A TEMPERATURE OF APPROXIMATELY 700 TO 750*C. AND A PRESSURE OF ABOUT 32,000 TO 35,000 POUNDS PER SQUARE INCH.
Claim 2
Independent Claim
55 words
A METHOD FOR MAKING AN INFRARED TRANSMITTING OPTICAL ELEMENT COMPRISING HOT PRESSING A PULVERULENT MASS OF AN ALKALINE EARTH FLUORIDE SELECTED FROM THE GROUP CONSISTING OF BARIUM FLUORIDE AND MAGNESIUM FLUORIDE TOGETHER WITH BORON NITRIDE AT A TEMPERATURE OF APPROXIMATELY 700 TO 750*C. AND A PRESSURE OF ABOUT 32,000 TO 35,000 POUNDS PER SQUARE INCH.
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) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |