US3879207A
Expired / Lapsed
US
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Glass for a fibre-optical element
Assignee: US Philips Corp
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Filing: 1973-03-27
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Granted: 1975-04-22
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Expires: 1993-03-27
Abstract
Abstract A core glass for fibre optics having a composition between the following limits in percent by weight:
Inventors
- 👤 Christianus Johannes M Hartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:02
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C13/00; C03C13/04; C03C13/045; C03C13/046; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
GLASS HAVING A HIGH REFRACTIVE INDEX WHICH IS PARTICULARLY SUITABLE AS A CORE OF GLASS FIBRES BUNDLED IN A FIBREOPTICAL ELEMENT AND WHICH CONSISTS ESSENTIALLY OF THE FOLLOWING CONSTITUENTS HAVING BETWEEN THE FOLLOWING LIMITS IN PERCENT BY WEIGHT:
Claim 2
Dependent Claim
38 words
GLASS HAVING A HIGH REFRACTIVE INDEX WHICH IS PARTICULARLY SUITABLE AS A CORE OF GLASS FIBRES BUNDLED IN A FIBREOPTICAL ELEMENT AND WHICH CONSISTS ESSENTIALLY OF THE FOLLOWING CONSTITUENTS HAVING BETWEEN THE FOLLOWING LIMITS IN PERCENT BY WEIGHT:
Claim 3
Dependent Claim
38 words
Glass having a high refractive index which is particularly suitable as a core of glass fibres bundled in a fibreoptical element and which consists essentially of the following constituents having between the following limits in percent by weight:
Claim 4
Dependent Claim
38 words
Glass having a high refractive index which is particularly suitable as a core of glass fibres bundled in a fibreoptical element and which consists essentially of the following constituents having between the following limits in percent by weight:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |