US4801566A
Expired / Lapsed
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Low expansion ceramic
Assignee: The Pennsylvania State University
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Filing: 1987-03-13
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Granted: 1989-01-31
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Expires: 2007-03-13
Abstract
Abstract Crystalline solid solutions and diphasic mixtures having a composition of Ca1-xMxZr4P6O24, where M is Ba and/or Sr and X is between about 0.25 and 0.75, have been produced which display both low anisotropy and near zero bulk thermal expansion behavior.
Inventors
- 👤 Santosh Y. Limaye
- 👤 Dinesh K. Agrawal
- 👤 Herbert A. McKinstry
- 👤 Rustum Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/447
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
A polycrystalline material having low bulk thermal expansion and low anisotropy comprising a solid solution having a composition of Ca 1-x M x Zr 4 P 6 O 24 or a diphasic mixture having a composition of (1-x)CaZr 4 P 6 O 24 +xMZ 4 P 6 O 24 , wherein M is Ba and/or Sr and x is between about 0.25 and 0.75.
Claim 2
Dependent Claim
64 words
A polycrystalline material having low bulk thermal expansion and low anisotropy comprising a solid solution having a composition of Ca 1-x M x Zr 4 P 6 O 24 or a diphasic mixture having a composition of (1-x)CaZr 4 P 6 O 24 +xMZ 4 P 6 O 24 , wherein M is Ba and/or Sr and x is between about 0.25 and 0.75.
Claim 3
Dependent Claim
14 words
The polycrystalline material of claim 1 wherein x is between about 0.25 and 0.5.
Claim 4
Dependent Claim
10 words
The polycrystalline material of claim 1 wherein M is Sr.
Claim 5
Dependent Claim
14 words
The polycrystalline material of claim 3 wherein X is between about 0.25 and 0.5.
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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |