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US4035819A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of making a zinc sulphide ceramic body and a zinc sulphide ceramic body made thereby

Assignee: Panasonic Holdings Corp
•
Filing: 1974-10-15
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Granted: 1977-07-12
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Expires: 1994-10-15
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Abstract

Abstract A method of making a zinc sulphide ceramic body having a low electrical resistance characterized by sulphurizing a starting oxide material consisting essentially of zinc oxide and from 0.01 atomic % to 6.0 atomic % of at least one oxide of a metal selected from the group consisting of aluminum, magnesium, nickel, cobalt, cadmium, lead, indium, bismuth, antimony, titanium, zirconium, silicon, tin, niobium, tantalum, tungsten, and the rare earth element metals in a carbon disulphide atmosphere at a temperature in the range of 700 DEG C to 1000 DEG C. This zinc sulphide ceramic body can be formed into non-linear elements such as phosphors, photoconductors, luminescent elements, varistors, piezoelectric transducers, capacitors and combinations thereof. Particularly, by using this zinc sulphide body in light emitting elements, the luminous efficiency as well as the working voltage can be improved.

Inventors

  • 👤 Tsuneharu Nitta
  • 👤 Shigeru Hayakawa
  • 👤 Yukio Kasahara
  • 👤 Ziro Terada

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 20:52
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0805; C09K11/0811; C04; C04B; C04B35/00; C04B35/515; C04B35/547; C04B35/622; C04B35/64

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 138 words
A method of making a junction ceramic body comprising a ceramic material having a layer consisting essentially of a zinc oxide ceramic body and a further layer consisting essentially of a corresponding sulphide ceramic body comprising: mixing a starting oxide material; pressure-compacting the thus mixed material; sintering the thus pressure-compacted material; and sulphurizing the surface layer of the thus sintered oxide material in a carbon disulphide atmosphere at a temperature in the range of 400° to 1000° C. so as to make said surface layer a sulphide, said oxide material consisting essentially of zinc oxide and from 0.01 atomic % to 6.0 atomic % of at least one oxide of a metal selected from the group consisting of aluminum, magnesium, nickel, cobalt, cadmium, lead, indium, bismuth, antimony, titanium, zirconium, silicon, tin, niobium, tantalum, tungsten and rare earth metals.
Claim 2
Independent Claim 138 words
A method of making a junction ceramic body comprising a ceramic material having a layer consisting essentially of a zinc oxide ceramic body and a further layer consisting essentially of a corresponding sulphide ceramic body comprising: mixing a starting oxide material; pressure-compacting the thus mixed material; sintering the thus pressure-compacted material; and sulphurizing the surface layer of the thus sintered oxide material in a carbon disulphide atmosphere at a temperature in the range of 400° to 1000° C. so as to make said surface layer a sulphide, said oxide material consisting essentially of zinc oxide and from 0.01 atomic % to 6.0 atomic % of at least one oxide of a metal selected from the group consisting of aluminum, magnesium, nickel, cobalt, cadmium, lead, indium, bismuth, antimony, titanium, zirconium, silicon, tin, niobium, tantalum, tungsten and rare earth metals.
Claim 3
Dependent Claim 11 words
A junction ceramic body made by the method of claim 1.

References Cited (Backward Citations)

US2310424A Cited
US2310425A Cited
US2573817A Cited
US2802792A Cited
US2908588A Cited
US3704232A Cited
US3691088A Cited
US3791844A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-07-11 1981-01-10 1981-07-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-07-11 1985-01-10 1985-07-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-07-11 1989-01-10 1989-07-12 $7700.00 Window Closed / Lapsed

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