US4285730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moldable glasses
Assignee: Corning Glass Works
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Filing: 1980-10-20
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Granted: 1981-08-25
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Expires: 2000-10-20
Abstract
Abstract The instant invention is concerned with the production of glasses which are capable of being molded or otherwise shaped under pressure at temperatures not exceeding about 450° C. Such glasses consist essentially, in mole percent as analyzed on the oxide basis, of at least 20% but less than 50% P 2 O 5 , 15-45% R 2 O, wherein R 2 O consists of 0-45% Li 2 O, 0-20% Na 2 O, and 0-10% K 2 O, and 0-20% RO, wherein RO consists of 0-10% MgO, 0-15% CaO, 0-20% SrO, and 0-20% BaO, with about 0.3-3% by weight F as analyzed in the final glass. Useful additions to the base compositions include PbO, La 2 O 3 , ZnO, and B 2 O 3 .
Inventors
- 👤 Leon M. Sanford
- 👤 Paul A. Tick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:20
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/247; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
An anhydrous glass suitable for being molded or otherwise shaped under pressure at temperatures below about 450° C. having a base composition wherein Al 2 O 3 is essentially absent consisting essentially, expressed in mole percent as analyzed on the oxide basis, of at least 20% but less than 50% P 2 O 5 , 15-45% R 2 O, wherein R 2 O consists of 0-45% Li 2 O, 0-20% Na 2 O, and 0-10% K 2 O, and 0-20% RO, wherein RO consists of 0-10% MgO, 0-15% CaO, 0-20% SrO, and 0-20% BaO, with about 0.3-3% by weight F as analyzed in the final glass.
Claim 2
Dependent Claim
106 words
An anhydrous glass suitable for being molded or otherwise shaped under pressure at temperatures below about 450° C. having a base composition wherein Al 2 O 3 is essentially absent consisting essentially, expressed in mole percent as analyzed on the oxide basis, of at least 20% but less than 50% P 2 O 5 , 15-45% R 2 O, wherein R 2 O consists of 0-45% Li 2 O, 0-20% Na 2 O, and 0-10% K 2 O, and 0-20% RO, wherein RO consists of 0-10% MgO, 0-15% CaO, 0-20% SrO, and 0-20% BaO, with about 0.3-3% by weight F as analyzed in the final glass.
Claim 3
Dependent Claim
34 words
A glass according to claim 1 also containing up to 20% PbO, up to 7% La 2 O 3 , and up to 12% ZnO, the total of said ingredients not exceeding about 25%.
Claim 4
Dependent Claim
27 words
A glass according to claim 1 also containing up to 25% B 2 O 3 when said P 2 O 5 content is less than about 30%.
Claim 5
Dependent Claim
28 words
A glass according to claim 1 also containing up to about 5% B 2 O 3 when said P 2 O 5 content is greater than about 45%.
Claim 6
Dependent Claim
60 words
A glass according to claim 1 suitable for being molded or otherwise shaped under pressure at temperatures below about 350° C. having a base composition consisting essentially of at least 40% P 2 O 5 , 17-25% Li 2 O+Na 2 O, consisting of 5-15% Li 2 O+5-15% Na 2 O, 10-15% BaO, and 10-15% PbO with about 0.3-1% F.
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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |