Patent US3308508A successfully refreshed from Google Patents.
US3607350A
Expired / Lapsed
US
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Electroless plating of plastics
Assignee: Dow Chemical Co
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Filing: 1967-12-05
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Granted: 1971-09-21
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Expires: 1987-12-05
Abstract
Abstract An organic plastic substrate is metal plated by the following essential steps (1) sulfonation with SO3 in a chlorinated hydrocarbon solvent, (2) neutralization of the sulfonated plastic in a dilute alkaline aqueous solution of an alkali compound, (3) immersing the neutralized, sulfonated plastic in a basic solution of silver nitrate and (4) coating a thin coat of copper or nickel on the activated, sulfonated plastic by means of a conventional electroless plating bath.
Inventors
- 👤 Richard J Rathsack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:02
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/2006; C23C18/2046; C23C18/2073; C23C18/2086; C23C18/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
25 words
The method of claim 1 in which the concentration of sulfur trioxide in the chlorinated solvent is about 0.1 to about 10 percent by weight.
Claim 2
Dependent Claim
26 words
The method of claim 2 in which the chlorinated hydrocarbon solvent is selected from the group consisting of carbon tetrachloride, tetrachloroethylene, methylene chloride and mixtures thereof.
Claim 3
Dependent Claim
30 words
The method of claim 1 in which the chlorinated hydrocarbon solvent is methylene chloride and the concentration of sulfur trioxide in said solvent is 2.5 to 4.0 percent by weight.
Claim 4
Dependent Claim
31 words
The method of claim 1 in which the dilute alkaline aqueous solution of an alkali compound has a concentration of about 0.1 to about 20 weight percent of the alkali compound.
Claim 5
Dependent Claim
19 words
The method of claim 5 in which the alkali compound is an alkali metal salt of a weak acid.
Claim 6
Dependent Claim
14 words
The method of claim 5 in which the alkali compound is a strong base.
Claim 7
Dependent Claim
13 words
The method of claim 5 in which the alkali compound is sodium bicarbonate.
Claim 8
Dependent Claim
37 words
The method of claim 1 in which the basic aqueous solution of silver nitrate contains about 0.2 to about 10 percent by weight of silver nitrate and about 1.0 to 4.0 percent by weight of ammonium hydroxide.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |