US4348484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision pressed glass object, glass, method of preparing glass
Assignee: US Philips Corp
•
Filing: 1980-06-19
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Granted: 1982-09-07
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Expires: 2000-06-19
Abstract
Abstract Glass objects, lenses in particular, can be pressed with precision from a glass which contains 45-55 mol. % P2O5, 15-40 mol. % BaO, 5-15 mol. % Li2O, 5-35 mol. % PbO, 0-2 mol. % Al2O3 and 0-6 mol. % F.
Inventors
- 👤 Hendrik J. M. Joormann
- 👤 Hendrik Verweij
- 👤 Jan Haisma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:34
CPC Classifications
G; G02; G02B; G02B1/00; C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/17; C03C3/23; C03C3/247; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A method of preparing glass containing P 2 O 5 , PbO and BaO by fusing together starting materials of said oxides, characterized in that a glass is prepared which consists essentially of 45-55 mol. % P 2 O 5 , 15-40 mol. % BaO, 5-35 mol. % PbO, 5-15 mol. % Li 2 O, 0-2 mol. % Al 2 O 3 and 0-6 mol. % F, wherein up to 25% of the BaO may be replaced by an equimolar quantity of one or more of the oxides CaO, MgO, and SrO, and up to 25% of the Li 2 O may be replaced by an equimolar quantity of one or more other alkali metal oxides.
Claim 2
Independent Claim
116 words
A method of preparing glass containing P 2 O 5 , PbO and BaO by fusing together starting materials of said oxides, characterized in that a glass is prepared which consists essentially of 45-55 mol. % P 2 O 5 , 15-40 mol. % BaO, 5-35 mol. % PbO, 5-15 mol. % Li 2 O, 0-2 mol. % Al 2 O 3 and 0-6 mol. % F, wherein up to 25% of the BaO may be replaced by an equimolar quantity of one or more of the oxides CaO, MgO, and SrO, and up to 25% of the Li 2 O may be replaced by an equimolar quantity of one or more other alkali metal oxides.
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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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |