US4116704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colored glassware
Assignee: Corning Glass Works
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Filing: 1978-02-06
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Granted: 1978-09-26
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Expires: 1998-02-06
Abstract
Abstract This invention is concerned with the production of transparent glass articles exhibiting an integral light gray-brown hue. More particularly, this invention is drawn to specific borosilicate-based glass compositions containing critically-defined amounts of Co 3 O 4 , NiO, and MnO 2 as colorants therefor. The resulting glasses exhibit a specifically-delineated transmittance curve in the visible portion of the radiation spectrum.
Inventors
- 👤 David C. Boyd
- 👤 James E. Flannery
- 👤 David W. Morgan
- 👤 Sara E. Rosplock
- 👤 Stella A. Sczerbaniewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:19
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C1/00; C03C1/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A clear, light gray-brown glass exhibiting a spectral transmittance curve approximating that set forth in FIG. 6, FIG. 8, and FIG. 9 having a composition consisting essentially, in parts by weight on the oxide basis, of about 4.7-5.15 Na 2 O, 2-2.21 Al 2 O 3 , 12.35-14.16 B 2 O 3 , 78.0-80.0 SiO 2 , 0.001-0.006 Co 3 O 4 , 0.037-0.055 NiO, and 0.21-0.6 MnO 2 .
Claim 2
Dependent Claim
70 words
A clear, light gray-brown glass exhibiting a spectral transmittance curve approximating that set forth in FIG. 6, FIG. 8, and FIG. 9 having a composition consisting essentially, in parts by weight on the oxide basis, of about 4.7-5.15 Na 2 O, 2-2.21 Al 2 O 3 , 12.35-14.16 B 2 O 3 , 78.0-80.0 SiO 2 , 0.001-0.006 Co 3 O 4 , 0.037-0.055 NiO, and 0.21-0.6 MnO 2 .
Claim 3
Dependent Claim
54 words
A clear, light gray-brown glass according to claim 1 consisting essentially, in parts by weight on the oxide basis, of about 4.7 Na 2 O, 2.0 Al 2 O 3 , 12.9 B 2 O 3 , 79.4 SiO 2 , 0.003 Co 3 O 4 , 0.055 NiO, and 0.21 MnO 2 .
Claim 4
Dependent Claim
54 words
A clear, light gray-brown, thermally tempered glass according to claim 1 consisting essentially, in parts by weight on the oxide basis, of ______________________________________
Na.sub.2 O 5.15 ± 0.1
B.sub.2 O.sub.3
12.35 ± 0.3
MnO.sub.2 0.5 ± 0.08
NiO 0.052 ± 0.002
Co.sub.3 O.sub.4
0.001 ± 0.0003
Al.sub.2 O.sub.3
2.0 ± 0.05
SiO.sub.2 Balance
______________________________________
References Cited (Backward Citations)
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US3294556A
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US3556821A
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US3907586A
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US3920463A
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US3984252A
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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) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |