US4041140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a sulphide ceramic body
Assignee: Panasonic Holdings Corp
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Filing: 1974-07-16
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Granted: 1977-08-09
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Expires: 1994-07-16
Abstract
Abstract A method of making a polycrystalline sulphide ceramic body by sulphurizing an oxide material in a carbon disulphide atmosphere at a temperature in the range of 400-1000 DEG C and less than the transforming temperature of the sulphide, which transforming temperature represents either the decomposition temperature or the sublimation temperature inherent to the sulphide. One of the advantages of this method is that sulphides can be easily made by the very strong reduction action of carbon disulphide. This application also relates to sulphides made thereby.
Inventors
- 👤 Tsuneharu Nitta
- 👤 Shigeru Hayakawa
- 👤 Yukio Kasahara
- 👤 Ziro Terada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:23
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/547; Y; Y10; Y10S; Y10S505/00; Y10S505/80; Y10S505/81; Y10S505/815
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A method of making a sulphide ceramic, comprising forming a compacted body from a metal oxide powder starting material, said powder having a mean particle size of less than 1 micron, and sulphurizing at least one portion of said compacted body in an atmosphere consisting essentially of carbon disulphide at a temperature in the range of 400° to 1,000° C., said temperature being less than the transformation temperature of said sulphide and for a time sufficient to make at least one portion a sulphide having a density of at least 92% and a uniform ceramic texture of from 1 to 10 microns grain size.
Claim 2
Independent Claim
104 words
A method of making a sulphide ceramic, comprising forming a compacted body from a metal oxide powder starting material, said powder having a mean particle size of less than 1 micron, and sulphurizing at least one portion of said compacted body in an atmosphere consisting essentially of carbon disulphide at a temperature in the range of 400° to 1,000° C., said temperature being less than the transformation temperature of said sulphide and for a time sufficient to make at least one portion a sulphide having a density of at least 92% and a uniform ceramic texture of from 1 to 10 microns grain size.
Claim 3
Dependent Claim
20 words
A method according to claim 1, wherein the compacting is performed at a pressure of about 750 kg/cm 2 .
Claim 4
Dependent Claim
42 words
A method according to claim 1 wherein said body of oxide material is prepared by pressure-compacting a starting oxide material, and said temperature and time being sufficient to make the whole of said oxide material a uniform sulphide by said sulphurizing step.
Claim 5
Dependent Claim
35 words
A method according to claim 1 wherein said body of oxide material is a dense ceramic prepared by mixing a starting polycrystalline oxide material, pressure-compacting the thus mixed material and sintering the thus pressure-compacted material.
Claim 6
Dependent Claim
70 words
A method according to claim 1 wherein said body of oxide material is prepared by mixing a starting polycrystalline oxide material, pressure-compacting the thus mixed material, sintering the thus pressure-compacted material into a ceramic, crushing the thus made ceramic into ceramic particles, and further pressure-compacting the thus made ceramic particles, and said temperature and time are sufficient to sulphurize at least the surface layer of each of said ceramic particles.
Claim 7
Dependent Claim
61 words
A method according to claim 1 wherein said oxide material is a metal oxide, the metal of which is at least one member selected from the group consisting of Zn, Cd, Pb, Cu, Sn, Ti, Zr, Nb, Ta, Cr, Mn, Fe, Ni, Co, Ga, In, Bi, Mg, Ca, Sr, Ba, Mo, Ce, La, Dy, Er, Eu, Nd, Sm, Y and V.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |