Patent US3824112A successfully refreshed from Google Patents.
US3824112A
Expired / Lapsed
US
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Permeable wollastonite ceramic mass
Assignee: Research Corp
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Filing: 1971-11-13
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Granted: 1974-07-16
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Expires: 1991-11-13
Abstract
Abstract A PERMEABLE CERAMIC STRUCTURE IS PREPARED BY FORMING A UNIFORM ADMIXTURE COMPRISING FINELY DIVIDED, HIGH MELTING POINT REFRACTORY CERAMIC MATERIAL, FINELY DIVIDED FLUXING THE MATERIAL AND HYDRATED SILICA GEL, THE MELTING POINT OF THE FLUXING MATERIAL BEING BELOW THE MELTING POINT OF THE REFRACTORY CERAMIC MATERIAL. THE RESULTING ADMIXTURE IS THENHEATED TO A TEMPERATURE TO DEHYDRATE THE SILICA GEL AND TO FUSE THE FLUXING MATERIAL TO PROVIDE A RESULTING PERMEABLE CERAMIC STRUCTURE WHEREIN THE COMPONENTS THEREOF ARE HELD TOGETHER BY MEANS OF A GLASSY BOND DERIVED BY FUSING SAID FLUXING MATERIAL.
Inventors
- 👤 W Lawrence
- 👤 L Coffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:49
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/34; B28B7/346; B28B7/344; C; C04; C04B; C04B35/00; C04B35/01; C04B35/16
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |