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US4049872A Expired / Lapsed US ⏱️ 0.0 years remaining

Glass frit composition for sealing window glass

Assignee: RCA Licensing Corp
•
Filing: 1976-07-12
•
Granted: 1977-09-20
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Expires: 1996-07-12
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Abstract

Abstract A barium-lithium-alumina-borate glass frit includes the following by weight on an oxide basis: 10.5-16.7% BaO; 10-11% Li2O; 2-3% Al2O3; and 70-77% B2O3. The frit can be fired, i.e., fused from powdered form to solid sealing glass, at low temperatures, e.g., about 530 DEG C. Firing can take place in an atmosphere which is inert, oxidizing, or reducing. After firing for a sufficient time, e.g., 3 hours, the sealing glass becomes fully devitrified. The devitrified sealing glass has an expansion coefficient substantially the same as that of window glass, i.e., about 90 x 10-7/ DEG C. The devitrified sealing glass can be reheated to temperatures in excess of 530 DEG C without deterioration or strains developing in a sealed joint.

Inventors

  • 👤 Kenneth Warren Hang

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 19:20
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/06; C03C10/00; C03C10/0054; C03C12/00; C03C3/00; C03C3/12; C03C3/14; C03C3/145; C03C8/00; C03C8/24

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 33 words
A devitrifiable glass frit consisting essentially by weight on an oxide basis of about 10-20% BaO, 10-11% Li 2 O, 2-7% Al 2 O 3 , and 66-77% B 2 O 3 .
Claim 2
Dependent Claim 33 words
A devitrifiable glass frit consisting essentially by weight on an oxide basis of about 10-20% BaO, 10-11% Li 2 O, 2-7% Al 2 O 3 , and 66-77% B 2 O 3 .
Claim 3
Dependent Claim 38 words
A glass frit in accordance with claim 1 which consists essentially by weight on an oxide basis of about 10.5-16.7% BaO, 10-11% Li 2 O, 2-3% Al 2 O 3 , and 70-77% B 2 O 3 .
Claim 4
Dependent Claim 51 words
A composite article comprising at least two preformed glass bodies with sealing material disposed therebetween, said sealing material comprising a devitrified glass consisting essentially by weight on an oxide basis of about 10-20% BaO, 10-11% Li 2 O, 2-7% Al 2 O 3 , and 66-77% B 2 O 3 .
Claim 5
Dependent Claim 51 words
A composite article comprising at least two preformed glass bodies with sealing material disposed therebetween, said sealing material comprising a devitrified glass consisting essentially by weight on an oxide basis of about 10-20% BaO, 10-11% Li 2 O, 2-7% Al 2 O 3 , and 66-77% B 2 O 3 .
Claim 6
Dependent Claim 42 words
A composite article in accordance with claim 3 in which said sealing material consists essentially by weight on an oxide basis of about 10.5-16.7% BaO, 10-11% Li 2 O, 2-3% Al 2 O 3 , and 70-77% B 2 O 3 .
Claim 7
Dependent Claim 17 words
A composite article in accordance with claim 4 in which said two preformed bodies comprise window glass.
Claim 8
Dependent Claim 27 words
A composite article in accordance with claim 5 in which said devitrified glass has a temperature coefficient of expansion of about 90 × 10 -7 /° C.
Claim 9
Dependent Claim 22 words
A composite article in accordance with claim 6 in which said devitrified glass is about 70 to about 75 volume percent crystalline.

References Cited (Backward Citations)

US3312556A Cited
US3912525A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-09-19 1981-03-21 1981-09-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-09-19 1985-03-21 1985-09-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-09-19 1989-03-21 1989-09-20 $7700.00 Window Closed / Lapsed

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