US3671380A
Expired / Lapsed
US
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Uv transmitting borosilicate glass composition and article
Assignee: IIT Research Institute
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Filing: 1970-04-13
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Granted: 1972-06-20
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Expires: 1990-04-13
Abstract
Abstract A GLASS SUITABLE FOR THE TRANSMISSION OF RADIATION IN THE NEAR ULTRAVIOLET REGION AND HAVING A RELATIVELY LOW INDEX OF REFRACTION RENDERING THE GLASS SUITABLE FOR CLADDING GLASS IN THE MANUFACTURE OF ULTRAVIOLET TRANSMITTING COMPOSITE FIBERS. THE GLASS IS COMPOSED OF B2O38 SIO2, A12O3, AND K2O AND IS SUBSTANTIALLY FREE OF ULTRAVIOLET ABSORBERS.
Inventors
- 👤 Mir Akbar Ali
- 👤 Alexis G Pincus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:34
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C13/00; C03C13/04; C03C13/045; C03C13/046; C03C3/062; C03C3/064; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/905; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |