US3380846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matte surface vitreous enamels and articles made therefrom
Assignee: B F Drakenfeld & Co Inc
•
Filing: 1965-05-27
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Granted: 1968-04-30
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Expires: 1985-05-27
Abstract
No abstract record available.
Inventors
- 👤 Robert S Murray
- 👤 Andrews Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:16
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/10; C03C8/12; C03C10/00; C03C10/0054; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24364; Y10T428/25; Y10T428/259
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
AS A NEW ARTICLE OF MANUFACTURE, A GLASS ARTICLE HAVING FUSED ON ONE SURFACE A COATING OF AN INTIMATE MIXTURE OF (1) A GLASS ENAMEL FRIT CONSISTING ESSENTIALLY OF, BY WEIGHT, 45 TO 60 PERCENT OF PBO, 20 TO 35 PERCENT OF SIO2, 6 TO 12 PERCENT OF B2O3, 1 TO 5 PERCENT OF AL2O3, AND FROM O TO 2 PERCENT ZRO2, AND (2) FROM 2 TO 75 PERCENT OF AMORPHOUS SILICA, PASSING A 350 MESH SIEVE, THE SURFACE OF SAID COATING CARRYING A THIN LAYER OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF 200 MESH AMORPHOUS SILICA, ALUMINA, AND VITREOUS AND SEMI-VITREOUS CLAY WARE, AND A LAYER OF POLYTERAFLUOROETHYLENE ADHERED TO SAID COATING.
Claim 2
Dependent Claim
115 words
AS A NEW ARTICLE OF MANUFACTURE, A GLASS ARTICLE HAVING FUSED ON ONE SURFACE A COATING OF AN INTIMATE MIXTURE OF (1) A GLASS ENAMEL FRIT CONSISTING ESSENTIALLY OF, BY WEIGHT, 45 TO 60 PERCENT OF PBO, 20 TO 35 PERCENT OF SIO2, 6 TO 12 PERCENT OF B2O3, 1 TO 5 PERCENT OF AL2O3, AND FROM O TO 2 PERCENT ZRO2, AND (2) FROM 2 TO 75 PERCENT OF AMORPHOUS SILICA, PASSING A 350 MESH SIEVE, THE SURFACE OF SAID COATING CARRYING A THIN LAYER OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF 200 MESH AMORPHOUS SILICA, ALUMINA, AND VITREOUS AND SEMI-VITREOUS CLAY WARE, AND A LAYER OF POLYTERAFLUOROETHYLENE ADHERED TO SAID COATING.
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |