US4001019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible light sensitive glass
Assignee: Hoya Glass Works Ltd
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Filing: 1974-04-02
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Granted: 1977-01-04
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Expires: 1994-04-02
Abstract
Abstract A reversible light sensitive glass comprising 100 parts of a base glass, 0.15 to 1.0 parts of Ag and an amount of halogen corresponding to or more than to the chemical equivalence of Ag, in which the base glass consists of, by weight %, SiO 2 48 to 62, Al 2 O 3 7 to 15, B 2 O 3 17 to 26, R 2 O (where R represents Na, Li or K) 6 to 16, BaO 0.5 to 5, (BaO/R 2 O 0.05 to 0.40), TiO 2 0 to 10, ZrO 2 0 to 10, Nb 2 O 5 0 to 5, TiO 2 +ZrO 2 +Nb 2 O 5 0.5 to 15, AS 2 O 3 0 to 2.0, and Sb 2 O 3 0 to 2.0 (AS 2 O 3 +Sb 2 O 3 <2.0).
Inventors
- 👤 Toshiharu Yamashita
- 👤 Tetsuro Izumitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:46
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/04; C03C4/06; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/093; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A reversible light sensitive glass comprising 100 weight parts of a base glass, 0.15 to 1.0 weight parts of Ag and an amount of halogen corresponding to or more than the chemical equivalence of the Ag, in which the base glass consists, in weight %, of SiO 2 48 to 62, Al 2 O 3 7 to 15, B 2 O 3 17 to 26, R 2 O, where R represents Na, Li or K, 6 to 16, BaO 0.5 to 5, BaO/R 2 O 0.05 to 0.40, TiO 2 0 to 10, ZrO 2 0 to 10, Nb 2 O 5 0 to 5, TiO 2 +ZrO 2 +Nb 2 O 5 0.5 to 15, As 2 O 3 0 to 2.0, Sb 2 O 3 0 to 2.0 and As 2 O 3 +Sb 2 O 3 <2.0.
Claim 2
Dependent Claim
140 words
A reversible light sensitive glass comprising 100 weight parts of a base glass, 0.15 to 1.0 weight parts of Ag and an amount of halogen corresponding to or more than the chemical equivalence of the Ag, in which the base glass consists, in weight %, of SiO 2 48 to 62, Al 2 O 3 7 to 15, B 2 O 3 17 to 26, R 2 O, where R represents Na, Li or K, 6 to 16, BaO 0.5 to 5, BaO/R 2 O 0.05 to 0.40, TiO 2 0 to 10, ZrO 2 0 to 10, Nb 2 O 5 0 to 5, TiO 2 +ZrO 2 +Nb 2 O 5 0.5 to 15, As 2 O 3 0 to 2.0, Sb 2 O 3 0 to 2.0 and As 2 O 3 +Sb 2 O 3 <2.0.
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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |