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Patent US3775164A successfully refreshed from Google Patents.
US3775164A
Expired / Lapsed
US
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Method of controlling crystallization of glass
Assignee: Pfaudler Inc
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Filing: 1971-05-10
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Granted: 1973-11-27
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Expires: 1991-05-10
Abstract
Abstract In providing metal substrates with a protective coating of partially crystallized glass, crystalline refractory materials are added to the crystallizable glass frit to retard the rate of crystallization in order to maintain the coating in a substantially amorphous condition during the firing of the glass coating so that substantially all crystals in the partially crystallized coating are formed during subsequent heat treating.
Inventors
- 👤 S Smith
- 👤 W Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:25
CPC Classifications
C; C03; C03C; C03C4/00; C03C10/00; C03C8/00; C03C8/14; C23; C23D; C23D5/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
A method as in claim 1 which comprises adding 3 to 15% by weight of said crystalline refractory material to said frit.
Claim 2
Dependent Claim
23 words
A method as in claim 1 wherein said crystalline refractory material is selected from the group consisting of SiO2, ZrSiO4, ZrO2, and TiO2.
Claim 3
Dependent Claim
114 words
In a method for forming a partially crystallized vitreous enamel coating on a metal substrate comprising the steps of smelting a crystallizable glass composition, quenching said smelted glass to form a frit, applying said frit to a metallic substrate, fusing said frit and heat treating to crystallize said fused frit; the method of inhibiting crystallization and controlling the character of crystals forming during heat treating by adding 1-15% by weight of a crystalline refractory material selected from the group consisting of Sio2, Cr2O3, Al2O3, ZrO2, ZrSiO4, TiO2, Li2O.TiO2.SiO2, Sb2O3, Ta2O5, WO3, La2O5 and Fe3O4 to said frit and milling said refractory material into said frit prior to application of said frit to said substrate.
References Cited (Backward Citations)
US2920971A
Cited
US3389458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |