US2963377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating refractory
Assignee: Harbison Walker Refractories Co
•
Filing: 1958-07-18
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Granted: 1960-12-06
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Expires: 1978-07-18
Abstract
No abstract record available.
Inventors
- 👤 Albert L Renkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:38
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C04B14/00; C04B14/02; C04B14/04; C04B14/14; C04B35/00; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A LIGHTWEIGHT INSULATING REFRACTORY THAT CONSISTS ESSENTIALLY OF TEMPERED AND DRIED MIXTURE CONTAINING, ON A SOLIDS BASIS, 10 TO 25 WEIGHT PERCENT OF EXPANDED PERLITE, 40 TO 75 WEIGHT PERCENT OF CRUDE KYANITE AND 15 TO 40 WEIGHT PERCENT OF A CALCIUM ALUMINATE CEMENT SAID PERLITE SIZED SO THAT ALL OF IT WILL PASS A 6-MESH TYLER SCREEN AND NOT MORE THAN 10 PERCENT OF IT WILL PASS A 100-MESH TYLER SCREEN, SAID CRUDE KYANITE BEING SIZED SO THAT ALL OF IT WILL PASS A 20-MESHS TYLER SCREEN AND AT LEAST 30 PERCENT OF IT WILL PASS A 100-MESH TYLER SCREEN, AND SAID CEMENT BEING SIZED TO PASS A 100-MESH TYLER SCREEN.
Claim 2
Dependent Claim
112 words
A LIGHTWEIGHT INSULATING REFRACTORY THAT CONSISTS ESSENTIALLY OF TEMPERED AND DRIED MIXTURE CONTAINING, ON A SOLIDS BASIS, 10 TO 25 WEIGHT PERCENT OF EXPANDED PERLITE, 40 TO 75 WEIGHT PERCENT OF CRUDE KYANITE AND 15 TO 40 WEIGHT PERCENT OF A CALCIUM ALUMINATE CEMENT SAID PERLITE SIZED SO THAT ALL OF IT WILL PASS A 6-MESH TYLER SCREEN AND NOT MORE THAN 10 PERCENT OF IT WILL PASS A 100-MESH TYLER SCREEN, SAID CRUDE KYANITE BEING SIZED SO THAT ALL OF IT WILL PASS A 20-MESHS TYLER SCREEN AND AT LEAST 30 PERCENT OF IT WILL PASS A 100-MESH TYLER SCREEN, AND SAID CEMENT BEING SIZED TO PASS A 100-MESH TYLER SCREEN.
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) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |