US2596669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making fortified cellular glass
Assignee: Pittsburgh Corning LLC
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Filing: 1947-03-12
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Granted: 1952-05-13
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Expires: 1967-03-12
Abstract
No abstract record available.
Inventors
- 👤 Walter D Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:52
CPC Classifications
C; C03; C03C; C03C11/00; C03C11/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A PROCESS FOR MANUFACTURING FORTIFIED CELLULAR GLASS RESISTANT TO PERMEATION BY WATER AT ELEVATED TEMPERATURE, COMPRISING THE STEPS OF PROVIDING AN INTIMATE MIXTURE OF FINELY PULVERIZED GLASS, SILICA AND CARBON BLACK, IN PROPORTIONS BY WEIGHT OF .1% TO .2% CARBON-10% TO 40% SILICA-AND THE BALANCE GLASS, HEATING THE MIXTURE IN CLOSED MOLDS TO A TEMPERATURE SUFFICIENT TO SINTER THE GLASS TO ENCLOSE THE SILICA AND CARBON BLACK, RAISING THE TEMPERATURE SUFFICIENTLY TO EFFECT A REACTION BETWEEN THE GLASS AND CARBON TO CELLULATE THE SINTERED MASS, AND THEREAFTER ANNEALING THE CELLULATED PRODUCT.
Claim 2
Dependent Claim
91 words
A PROCESS FOR MANUFACTURING FORTIFIED CELLULAR GLASS RESISTANT TO PERMEATION BY WATER AT ELEVATED TEMPERATURE, COMPRISING THE STEPS OF PROVIDING AN INTIMATE MIXTURE OF FINELY PULVERIZED GLASS, SILICA AND CARBON BLACK, IN PROPORTIONS BY WEIGHT OF .1% TO .2% CARBON-10% TO 40% SILICA-AND THE BALANCE GLASS, HEATING THE MIXTURE IN CLOSED MOLDS TO A TEMPERATURE SUFFICIENT TO SINTER THE GLASS TO ENCLOSE THE SILICA AND CARBON BLACK, RAISING THE TEMPERATURE SUFFICIENTLY TO EFFECT A REACTION BETWEEN THE GLASS AND CARBON TO CELLULATE THE SINTERED MASS, AND THEREAFTER ANNEALING THE CELLULATED PRODUCT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-13 | 1955-11-12 | 1956-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-13 | 1959-11-12 | 1960-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-13 | 1963-11-12 | 1964-05-13 | $7700.00 | Window Closed / Lapsed |