Patent US3785722A successfully refreshed from Google Patents.
US3785722A
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USE OF SiO{11 -NB{11 O{11 {11 AND/OR Ta{11 O{11 {11 GLASSES AS ULTRAVIOLET FILTERS
Assignee: Corning Glass Works
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Filing: 1972-06-20
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Granted: 1974-01-15
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Expires: 1992-06-20
Abstract
Abstract Glass filters and their use in controlling transmission of radiation is disclosed. The filters have a sharp transmission cut off within the ultraviolet region of the spectrum and also withstand high temperatures and severe heat shock. They are produced from a fused silica glass having a composition consisting essentially of silica and 1-25 percent R2O5 wherein the R2O5 consists of 0-5 percent Nb2O5 and/or 0-25 percent Ta2O5. The transmission cut off may be shifted across the ultraviolet transmission range by varying the amount of additive.
Inventors
- 👤 P Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:28
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C4/085; C03C3/00; C03C3/04; C03C3/06; C03C3/076; C03C3/083; G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/226; C03C2201/00; C03C2201/06; C03C2201/30; C03C2201/40; C03C2203/00; C03C2203/10; C03C2203/40
Claims Analysis
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References Cited (Backward Citations)
US2326059A
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US3031318A
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US3597252A
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US3499775A
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US3677960A
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US3644607A
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US3711262A
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US3717441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |