US3762938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deposition of thin metal films
Assignee: Dow Chemical Co
•
Filing: 1971-03-29
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Granted: 1973-10-02
•
Expires: 1991-03-29
Abstract
Abstract An electroless process for depositing elemental metallic coatings on solid substrates. The process comprises forming a hydride of the primary metal to be deposited in situ on a substrate and subjecting the metal hydride to sufficient energy to deposit the elemental form of the metal on the substrate.
Inventors
- 👤 R Ridenour
- 👤 K Groves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:59
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
123 words
The process of claim 1 wheRein: a the aluminum hydride is used in an amount at least sufficient to react with the metal compound to form the corresponding heavy metal hydride up to about the amount of aluminum hydride to stoichiometrically react with the metal compound to form the corresponding heavy metal hydride and aluminum compound and deposit the heavy metal hydride on the substrate; b contacting at least part of the contacted substrate with a solvent for the aluminum compound to remove aluminum compound from the substrate; c subjecting at least part of the substrate contacted in Step (b) to a source of energy sufficient to form a metal coating on the subjected substrate containing the elemental form of the heavy metal.
Claim 2
Dependent Claim
34 words
The process of claim 2 wherein in Step (a) the substrate is contacted with an aluminum hydride solution, the solvent thereof being a mutual solvent for the aluminum hydride and the heavy metal compound.
Claim 3
Dependent Claim
10 words
The process of claim 2 wherein the energy comprises heat.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein the energy comprises actinic light.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein the energy comprises high energy radiation.
Claim 6
Dependent Claim
39 words
The process of claim 2 wherein the metal compound is applied to the substrate as a liquid suspension containing the metal compound and the aluminum hydride is contacted with the metal compound as a liquid suspension containing aluminum hydride.
Claim 7
Dependent Claim
41 words
The process of claim 2 wherein: a at least a portion of the metal compound comprises at least a catalytic amount of a compound containing a heavy metal selected from the group consisting of Ti, Zr, Hf, V, Nb, or Ta.
Claim 8
Dependent Claim
57 words
The process of claim 1 wherein the heavy metal is selected from the group consisting of Sc, Y, La, Cr, Mo, W, Mn, Tc, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Ga, In, Tl, Sn, and Pb and aluminum hydride is used in a greater than stoichiometric amount.
Claim 9
Dependent Claim
37 words
The process of claim 9 wherein the substrate is also contacted with at least a catalytic amount of a compound of a heavy metal selected from the group consisting of Ti, Zr, Hf, V, Nb and Ta.
Claim 10
Dependent Claim
31 words
The process of claim 9 wherein the substrate is contacted with an aluminum hydride solution, the solvent thereof being a mutual solvent for the aluminum hydride and the heavy metal compound.
Claim 11
Dependent Claim
10 words
The process of claim 9 wherein the energy comprises heat.
Claim 12
Dependent Claim
11 words
The process of claim 9 wherein the energy comprises actinic light.
Claim 13
Dependent Claim
12 words
The process of claim 9 wherein the energy comprises high energy radiation.
Claim 14
Dependent Claim
39 words
The process of claim 9 wherein the metal compound is applied to the substrate as a liquid suspension containing the metal compound and the aluminum hydride is contacted with the metal compound as a liquid suspension containing aluminum hydride.
Claim 15
Dependent Claim
46 words
The process of claim 9 wherein said substrate is also contacted with a catalytic amount of substrate is also contacted with a catalystic amount of at least one compound of a heavy metal selected from the group consisting of Ti, Zr, Hf, V, Nb and Ta.
Claim 16
Dependent Claim
12 words
The method of claim 1 wherein the aluminum hydride is aluminum trihydride.
Claim 17
Dependent Claim
12 words
The method of claim 2 wherein the aluminum hydride is aluminum trihydride.
Claim 18
Dependent Claim
12 words
The method of claim 9 wherein the aluminum hydride is aluminum trihydride.
Claim 19
Dependent Claim
16 words
The method of claim 1 wherein the substrate is first contacted with the heavy metal compound.
Claim 20
Dependent Claim
16 words
The method of claim 9 wherein the substrate is first contacted with the heavy metal compound.
Claim 21
Dependent Claim
37 words
The process of claim 1 including sequentially contacting the substrate with the heavy metal compound, contacting the substrate with the aluminum hydride and then subjecting the aluminum hydride and heavy metal compound to a source of energy.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |