US3726698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass with controlled ultraviolet transmission
Assignee: Corning Glass Works
•
Filing: 1971-01-21
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Granted: 1973-04-10
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Expires: 1991-01-21
Abstract
Abstract THIS INVENTION RELATES TO CROWN GLASSES WHEREIN THE CUT, I.E., THE WAVE LENGTH LIMITS WITHIN WHICH MUST LIE THE WAVE LENGTH AT WHICH THE TRANSMITTANCE IS 37%, CAN BE ADJUSTED TO WAVE LENGTHS BETWEEN ABOUT 3500 A.-3900 A. THESE GLASSES CONSIST ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIS, FOR ABOUT 0.1-5% CEO2, 0.5-5% LA2O3, 5-10% ZNO, 15-22% B2O3, 15-23% SIO2, AND 43-50% BAO.
Inventors
- 👤 G Hares
- 👤 D Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:00
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |