US2809898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous ceramic mold and method of making same
Assignee: General Electric Co
•
Filing: 1954-02-16
•
Granted: 1957-10-15
•
Expires: 1974-02-16
Abstract
No abstract record available.
Inventors
- 👤 Ludwig E Thiess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:40
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/34; B28B7/344; C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PERMANENT POROUS CERAMIC MOLD COMSISTING ESSENTIALLY OF 25 TO 27% BALL CLAY, 10 TO 28% CHINA CLAY, AND 65 TO 45% CALCINED ALUMINA BY WIGHT, SAID CERAMIC MOLD HAVING A PORE VOLUME OF 36 TO 48% AND A MOISTURE AABSORPTION CAPACITY OF 24 TO 34% BY WEIGHT, AND SAID CERAMIC MOLD HAVING A TENSILE STRENGTH OF ABOUT 580 P.S.I.
Claim 2
Dependent Claim
60 words
A PERMANENT POROUS CERAMIC MOLD COMSISTING ESSENTIALLY OF 25 TO 27% BALL CLAY, 10 TO 28% CHINA CLAY, AND 65 TO 45% CALCINED ALUMINA BY WIGHT, SAID CERAMIC MOLD HAVING A PORE VOLUME OF 36 TO 48% AND A MOISTURE AABSORPTION CAPACITY OF 24 TO 34% BY WEIGHT, AND SAID CERAMIC MOLD HAVING A TENSILE STRENGTH OF ABOUT 580 P.S.I.
References Cited (Backward Citations)
US1439286A
Cited
US1476001A
Cited
US1882701A
Cited
US2441695A
Cited
US2682692A
Cited
US2675324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |