US4026994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing gallium phosphide
Assignee: Toshiba Corp
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Filing: 1976-02-13
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Granted: 1977-05-31
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Expires: 1996-02-13
Abstract
Abstract A method is directed to manufacturing gallium phosphide by reducing gallium orthophosphate in a reducing atmosphere while heating it. In reduction, phosphorus, gallium phosphide and/or phosphine is added as an additive to gallium orthophosphate.
Inventors
- 👤 Makoto Tashiro
- 👤 Keijiro Hirahara
- 👤 Akihiro Yahata
- 👤 Masanobu Ohyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:54
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
A method for manufacturing gallium phosphide comprising: (a) charging gallium orthophosphate and an additive selected from the group consisting of phosphorous and gallium phosphide into a reactor: (b) heating said gallium orthophosphate at a temperature of 750°-1100° C.; and (c) introducing a reducing gas into the reaction; wherein said reducing gas is directed both horizontally and vertical down toward said gallium orthophosphate.
Claim 2
Independent Claim
62 words
A method for manufacturing gallium phosphide comprising: (a) charging gallium orthophosphate and an additive selected from the group consisting of phosphorous and gallium phosphide into a reactor: (b) heating said gallium orthophosphate at a temperature of 750°-1100° C.; and (c) introducing a reducing gas into the reaction; wherein said reducing gas is directed both horizontally and vertical down toward said gallium orthophosphate.
Claim 3
Dependent Claim
17 words
The method according to claim 1, in which said reduction is effected at 800° to 900° C.
Claim 4
Dependent Claim
59 words
The mthod according to claim 1, in which said step of introducing a reducing gas is carried out by first and second tubes extending to the reactor, the first tube having a plurality of holes located above gallium orthophosphate through which the reducing gas vertically flows to the gallium orthophosphate, and the second tube horizontally introducing the reducing gas.
Claim 5
Dependent Claim
27 words
The method according to claim 3, in which the flow rate of the reducing gas from the first tube, to the second tube is 1:1 to 4:1.
Claim 6
Dependent Claim
24 words
The method according to claim 1, in which said additive is placed in the form of a mixture with gallium orthophosphate in the reactor.
Claim 7
Dependent Claim
23 words
The method according to claim 1, in which said additive is phosphorus which is placed at a predetermined interval from the gallium orthophosphate.
Claim 8
Independent Claim
45 words
A method for manufacturing gallium phosphide comprising the steps of inserting gallium orthophosphate in a reactor and reducing gallium orthophosphate at a temperature of 750° C. to 1100° C., with a phosphine containing reducing gas directed both horizontally and vertically down toward said gallium orthophosphate.
Claim 9
Independent Claim
45 words
A method for manufacturing gallium phosphide comprising the steps of inserting gallium orthophosphate in a reactor and reducing gallium orthophosphate at a temperature of 750° C. to 1100° C., with a phosphine containing reducing gas directed both horizontally and vertically down toward said gallium orthophosphate.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |