US4220682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strengthened glass structural member
Assignee: Individual
•
Filing: 1978-06-19
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Granted: 1980-09-02
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Expires: 1998-06-19
Abstract
Abstract The present invention relates to a new glass material applicable in those situations where thermal and/or mechanical shock would limit the use of other glass materials presently available. Dopants are deposited into the interconnected pores of a porous glass in a non-uniform manner such that upon consolidation and cooling the final article has its surface under compressive stress. Dopants may also be added to control color and other appearance features.
Inventors
- 👤 Pedro B. Macedo
- 👤 Theodore A. Litovitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:29
CPC Classifications
C; C03; C03C; C03C23/00; C03C23/0095; C03C11/00; C03C11/005; C03C13/00; C03C13/04; C03C13/045; C03C13/046; C03C3/00; C03C3/04; C03C3/06; C03C3/061; C03C3/076; C03C3/089; G; G02; G02B; G02B6/00; G02B6/02; C03B; C03B2201/00; C03B2201/06; C03B2201/08; C03B2201/10; C03B2201/30; C03B2201/32; C03B2201/34; C03B2201/50; C03B2201/54; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
63 words
A rigid shaped glass article comprised of a glass whose glass transition temperature is greater at the surface of said article than in the interior and has a greater silica concentration at the surface than in the interior and wherein the concentration of silica throughout said glass is greater than 80 mole percent, said glass article having a stepped glass transition temperature profile.
Claim 2
Dependent Claim
63 words
A rigid shaped glass article comprised of a glass whose glass transition temperature is greater at the surface of said article than in the interior and has a greater silica concentration at the surface than in the interior and wherein the concentration of silica throughout said glass is greater than 80 mole percent, said glass article having a stepped glass transition temperature profile.
Claim 3
Dependent Claim
22 words
An article according to claim 1, wherein said article has a thermal expansion coefficient greater in the interior than at the surface.
Claim 4
Dependent Claim
20 words
An article according to claim 1 wherein the concentration of B 2 O 3 is at least 2 mole percent.
Claim 5
Dependent Claim
20 words
An article according to claim 3 wherein the concentration of silica throughout said glass is greater than 90 mole percent.
Claim 6
Dependent Claim
12 words
An article according to claim 1 wherein said article is a window.
Claim 7
Dependent Claim
12 words
An article according to claim 1 wherein said article is a windshield.
Claim 8
Dependent Claim
13 words
An article according to claim 1 wherein said article is a radar dome.
Claim 9
Dependent Claim
13 words
An article according to claim 1 wherein said article is a stove top.
Claim 10
Dependent Claim
12 words
An article according to claim 1 wherein said article is a pipe.
Claim 11
Dependent Claim
13 words
An article according to claim 1 wherein said article is a cooking utensil.
Claim 12
Dependent Claim
14 words
An article according to claim 1 wherein said article is a chemical laboratory utensil.
Claim 13
Dependent Claim
13 words
An article according to claim 1 wherein said article is a glass container.
Claim 14
Dependent Claim
13 words
An article according to claim 1 wherein said article is a structural member.
References Cited (Backward Citations)
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Cited
US2336227A
Cited
US2522524A
Cited
US3464807A
Cited
US3779856A
Cited
US3938974A
Cited
US4110096A
Cited
US4061486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |