Patent US3635758A successfully refreshed from Google Patents.
US3635758A
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Electroless metal deposition
Assignee: Kollmorgen Corp
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Filing: 1969-08-04
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Granted: 1972-01-18
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Expires: 1989-08-04
Abstract
Abstract An improved method for enhancing the ductility of electroless metal deposits is provided in which an electroless metal bath contains an extraneous ion which has a preferential capacity for being coulombically adsorbed at the outer layer of an electric double layer present on an interface in contact with such bath on which said metal is electrolessly depositing, such ion being present in an amount sufficient to reduce the inclusion of hydrogen in the electrolessly deposited metal.
Inventors
- 👤 Frederick W Schneble Jr
- 👤 John F Mccormack
- 👤 Rudolph J Zeblisky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:05
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/38; C23C18/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
The method of claim 1, wherein said extraneous ion not electrostatically adsorbed at the outer layer is chemisorbed at the inner layer of the electric double layer.
Claim 2
Dependent Claim
14 words
The method of claim 1, wherein the extraneous ion is a phosphorus containing ion.
Claim 3
Dependent Claim
29 words
The method of claim 1, wherein the electroless metal deposition solution comprises as a stabilizing agent a member selected from the group consisting of divalent sulfur compounds and sulfites.
Claim 4
Dependent Claim
38 words
The method of claim 1, wherein the electroless metal deposition solution comprises as an agent for increasing the rate of deposition of the electroless metal a member selected from the group consisting of hexacyanoferrate (II) and hexacyanoferrate (III).
Claim 5
Dependent Claim
29 words
The method of claim 5, wherein the electroless metal deposition solution comprises as a stabilizing agent a member selected from the group consisting of divalent sulfur compounds and sulfites.
Claim 6
Dependent Claim
26 words
The method of claim 1, wherein the surface contacted with the electroless metal deposition solution is selectively sensitized in designated areas, thereby forming a printed circuit.
Claim 7
Dependent Claim
37 words
The method of claim 1, wherein the electroless metal deposition solution comprises less than 25 parts per million of an ion having an oxidation potential greater than the oxidation potential of the particular ion being electrolessly deposited.
Claim 8
Dependent Claim
23 words
The method of claim 1, wherein the extraneous ion is present in an amount of from about 0.02 to 0.08 mole per liter.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |