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US3146115A
Expired / Lapsed
US
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Refractory brick
Assignee: Harbison Walker Refractories Co
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Filing: 1962-04-05
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Granted: 1964-08-25
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Expires: 1982-04-05
Abstract
No abstract record available.
Inventors
- 👤 Berhl E Wishon
- 👤 Raymond E Birch
- 👤 Donald F Stock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
AN IMPROVED SEMI-SILICA BRICK MADE FROM A BATCH CONSISTING ESSENTIALLY OF FROM 70 TO 90%, BY WEIGHT, OF SILICEOUS CLAY, AND FROM ABOUT 30 TO 10%, BY WEIGHT, OF CRUDE PYROPHYLLITE, SAID BRICK BEING BURNED.
Claim 2
Dependent Claim
35 words
AN IMPROVED SEMI-SILICA BRICK MADE FROM A BATCH CONSISTING ESSENTIALLY OF FROM 70 TO 90%, BY WEIGHT, OF SILICEOUS CLAY, AND FROM ABOUT 30 TO 10%, BY WEIGHT, OF CRUDE PYROPHYLLITE, SAID BRICK BEING BURNED.
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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |