US3578471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal shock resistant ceramic material
Assignee: Corning Glass Works
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Filing: 1969-11-10
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Granted: 1971-05-11
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Expires: 1989-11-10
Abstract
Abstract CERAMIC BODIES COMPOSED OF A PLURALITY OF PHASES HAVING MARKEDLY DIFFERENT COEFFICIENTS OF THERMAL EXPANSION. THE CERAMIC BODIES ARE CHARACTERIZED BY GRAIN BOUNDARY AND INTRACRYSTALLINE CRACKING. THE CERAMICS HAVE COMPOSITIONS ANALYTICALLY DEFINED BY AND SELECTED FROM THE GROUPS CONSISTING OF: (1) FIRST COMPOSITIONS IN THE AREA AND ALONG THE BOUNDARIES DEFINED BY THE LETTERS A, B, C, D, E, F, G, M, N IN FIG. 1 OF THE DRAWING; (2) SECOND COMPOSITIONS IN THE AREA AND ALONG THE BOUNDARIES DEFINED BY THE LETTERS A'', B'', C'', D'', E'', F'', G'', M'', N'' IN FIG. 2 OF THE DRAWING, AND (3) MIXTURES OF SAID FIRST AND SECOND COMPOSITIONS.
Inventors
- 👤 Irwin M Lachman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:45
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/478; F; F01; F01N; F01N2310/00; F01N2310/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |