Patent US3780427A successfully refreshed from Google Patents.
US3780427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ohmic contact to zinc sulfide devices
Assignee: Monsanto Co
•
Filing: 1970-10-28
•
Granted: 1973-12-25
•
Expires: 1990-10-28
Abstract
Abstract A zinc sulfide body is treated to form an ohmic contact by applying a Group II metal or alloy thereof to a surface region of the body in the presence of a source of donor precursor such as a Group IIIa metal or a halogen and heating the region to a temperature above the melting temperature of the metal or alloy.
Inventors
- 👤 R Jenkins
- 👤 C Mead
- 👤 J Mccaldin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:40
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; H01; H01B; H01B1/00; H01B1/06; H01B1/10; H10; H10D; H10D64/00; H10D64/01; H10D64/011; H10D64/60; H10D64/62; Y; Y10; Y10S; Y10S148/00; Y10S148/02; Y10S148/064
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
19 words
A method according to clAim 1 in which said body is heated to a temperature of at least 350*C.
Claim 2
Dependent Claim
21 words
A method according to claim 2 in which said metal is brought into intimate contact with the surface of said region.
Claim 3
Dependent Claim
14 words
A method according to claim 1 in which said Group II metal is cadmium.
Claim 4
Dependent Claim
16 words
A method according to claim 1 in which said donor precursor is a Group IIIa metal.
Claim 5
Dependent Claim
17 words
A method according to claim 5 in which said Group IIIa metal is indium, aluminum or gallium.
Claim 6
Dependent Claim
24 words
A method according to claim 1 in which said donor precursor is a halogen selected from the group consisting of chlorine, bromine or iodine.
Claim 7
Dependent Claim
22 words
A method according to claim 5 in which said donor precursor is present in the surface region of said zinc sulfide body.
Claim 8
Dependent Claim
24 words
A method according to claim 8 in which said donor precursor is present in said region in a density of at least 1017cm 3.
Claim 9
Dependent Claim
25 words
A method according to claim 9 in which the net donor precursor density in said region after the heating step is at least 1018cm 3.
Claim 10
Dependent Claim
28 words
A method according to claim 5 in which said Group IIIa metal source is alloyed with said Group II metal prior to its being applied to said body.
Claim 11
Dependent Claim
26 words
A method as recited in claim 1 wherein the surface region of said body of n-type zinc sulfide is first wetted with an amalgam including mercury.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |