Patent US3189337A successfully refreshed from Google Patents.
US3189337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous silica refractory structures
Assignee: Glasrock Products Inc
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Filing: 1960-09-07
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Granted: 1965-06-15
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Expires: 1980-09-07
Abstract
No abstract record available.
Inventors
- 👤 John W North
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:56
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/0006; C21D9/0025; C04; C04B; C04B28/00; C04B28/24; C04B38/00; Y; Y10; Y10S; Y10S65/00; Y10S65/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A REFRACTORY STRUCTURE COMPRISING A PLURALITY OF FUSED SILICA BLOCKS CEMENTED TOGETHER WITH A FUSED SILICA CEMENT, SAID CEMENT BEING FORMED INITALLY FROM GRAINS OF FUSED SILICA, WATER AND COLLOIDAL SILICA, SAID BLOCK INCLUDING GRAINS OF FUSED SILICA BONDED TOGETHER BY MINUTE QUANTITIES OF CRYSTOBOLITE, SAID BLOCK BEING AN OPNE CELL MEMBER WITH A DENSITY OF FROM .5 TO .9 GM./CC., THE STRUCTURE BEING CAPABLE OF WITHSTANDING TEMPERATURES OF 2000*F., SAID BLOCKS FORMING A PAIR OF MATING MOLD ELEMENTS, AND LAYERS OF CEMENT ALONG THE MATING SURFACES OF SAID BLOCKS.
Claim 2
Dependent Claim
90 words
A REFRACTORY STRUCTURE COMPRISING A PLURALITY OF FUSED SILICA BLOCKS CEMENTED TOGETHER WITH A FUSED SILICA CEMENT, SAID CEMENT BEING FORMED INITALLY FROM GRAINS OF FUSED SILICA, WATER AND COLLOIDAL SILICA, SAID BLOCK INCLUDING GRAINS OF FUSED SILICA BONDED TOGETHER BY MINUTE QUANTITIES OF CRYSTOBOLITE, SAID BLOCK BEING AN OPNE CELL MEMBER WITH A DENSITY OF FROM .5 TO .9 GM./CC., THE STRUCTURE BEING CAPABLE OF WITHSTANDING TEMPERATURES OF 2000*F., SAID BLOCKS FORMING A PAIR OF MATING MOLD ELEMENTS, AND LAYERS OF CEMENT ALONG THE MATING SURFACES OF SAID BLOCKS.
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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) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |