US2720462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory products
Assignee: Ortech Corp
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Filing: 1950-11-28
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Granted: 1955-10-11
•
Expires: 1970-11-28
Abstract
No abstract record available.
Inventors
- 👤 Jones James Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:21
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A REFRACTORY PRODUCT ADAPTED TO MAINTAIN ITS DIMENSIONAL STABILITY UP TO 3000* F. AND FORMED AT A FIRING TEMPERATURE SUBSTANTIALLY LESS THAN 3000* F. AND CONSISTING OF A MIXTURE FIRED AT SAID LOWER TEMPERATURE COMPRISING IN COMBINATION RICE HULL ASH BEING A MIXTURE OF THE CLASS OF "PINK" AND "BLACK" ASH HAVING SILICA PRESENT PRINCIPALLY IN CRISTOBALITE AND TRIDYMITE FORMS, AND AN ALKALINE EARTH METAL OXIDE PRESENT IN AN AMOUNT OF LESS THAN 20% BY WEIGHT OF THE MIX ADAPTED TO FORM A SILICAALKALINE EARTH METAL OXIDE BOND WITH SAID SILICA WHEN THE MIXTURE IS FIRED AT SAID FIRING TEMPERATURE, THE SAID ALKALINE EARTH METAL OXIDE BEING SUBSTANTIALLY THE SOLE CONSTITUENT IN SAID MIX ADAPTED TO FORM A CERAMIC BOND WITH THE SILICA THEREOF, AND AN ORGANIC BINDER IN SAID MIX FOR PROVIDING "GREEN" STRENGTH THEREOF BEFORE FIRING BUT CARBONIZABLE AT FIRING TEMPERATURES.
Claim 2
Dependent Claim
143 words
A REFRACTORY PRODUCT ADAPTED TO MAINTAIN ITS DIMENSIONAL STABILITY UP TO 3000* F. AND FORMED AT A FIRING TEMPERATURE SUBSTANTIALLY LESS THAN 3000* F. AND CONSISTING OF A MIXTURE FIRED AT SAID LOWER TEMPERATURE COMPRISING IN COMBINATION RICE HULL ASH BEING A MIXTURE OF THE CLASS OF "PINK" AND "BLACK" ASH HAVING SILICA PRESENT PRINCIPALLY IN CRISTOBALITE AND TRIDYMITE FORMS, AND AN ALKALINE EARTH METAL OXIDE PRESENT IN AN AMOUNT OF LESS THAN 20% BY WEIGHT OF THE MIX ADAPTED TO FORM A SILICAALKALINE EARTH METAL OXIDE BOND WITH SAID SILICA WHEN THE MIXTURE IS FIRED AT SAID FIRING TEMPERATURE, THE SAID ALKALINE EARTH METAL OXIDE BEING SUBSTANTIALLY THE SOLE CONSTITUENT IN SAID MIX ADAPTED TO FORM A CERAMIC BOND WITH THE SILICA THEREOF, AND AN ORGANIC BINDER IN SAID MIX FOR PROVIDING "GREEN" STRENGTH THEREOF BEFORE FIRING BUT CARBONIZABLE AT FIRING TEMPERATURES.
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) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |