US3903328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive coating
Assignee: International Business Machines Corp
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Filing: 1974-04-26
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Granted: 1975-09-02
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Expires: 1994-04-26
Abstract
Abstract A process of applying a conductive coating to an article to provide electromagnetic and electrostatic energy shielding and grounding. The article is first coated with a sufficient amount of a metallic copper pigmented resin to provide a pigment particle to particle contact upon drying. A synergistic effect is obtained by then coating the copper pigment with a graphite pigmented resin. A sufficient amount of graphite pigmented resin is used to prevent oxidation of the copper pigment and enhance electrical conductivity.
Inventors
- 👤 Jr Ernest Russell Burdette
- 👤 David Downing Dean
- 👤 William Lunsford Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:19
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/54; B05D7/544; H; H01; H01B; H01B1/00; B05D5/00; B05D5/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
61 words
A process of applying a conductive coating to an article comprising: a. coating said article with a metallic copper pigmented thermoplastic resin; b. drying said copper pigmented coating; c. coating said copper coating with a sufficient amount of a graphite pigmented water-dispersed resin to cover, and prevent oxidation of, said copper pigment, upon drying; and d. drying said graphite pigmented coating.
Claim 2
Dependent Claim
61 words
A process of applying a conductive coating to an article comprising: a. coating said article with a metallic copper pigmented thermoplastic resin; b. drying said copper pigmented coating; c. coating said copper coating with a sufficient amount of a graphite pigmented water-dispersed resin to cover, and prevent oxidation of, said copper pigment, upon drying; and d. drying said graphite pigmented coating.
Claim 3
Dependent Claim
26 words
a process according to claim 1 wherein said copper pigmented resin contains within the range of from about 25 to 40% by weight metallic copper pigment.
Claim 4
Dependent Claim
26 words
A process according to claim 1 wherein said graphite pigmented resin contains within the range of from about 20 to 40% by weight carbon as graphite.
Claim 5
Dependent Claim
13 words
A process according to claim 1 wherein said thermoplastic resin is ethyl cellulose.
Claim 6
Dependent Claim
32 words
A PROCESS ACCORDING TO CLAIM 1 WHEREIN SAID ARTICLE IS COATED WITH A SUFFICIENT AMOUNT OF SAID METALLIC COPPER PIGMENTED THERMOPLASTIC RESIN TO PROVIDE A PIGMENT PARTICLE TO PARTICLE CONTACT UPON DRYING.
Claim 7
Dependent Claim
99 words
A process of applying a conductive coating to an article for electromagnetic shielding electrostatic grounding purposes, said process comprising: a. coating said article with a metallic copper pigmented thermoplastic resin containing within the range of from about 25 to 40% by weight metallic copper pigment; b. drying said copper pigmented coating; c. coating said copper coating with a sufficient amount of a graphite pigmented water-dispersed resin containing within the range of from about 20 to 40% by weight carbon as graphite to cover, and prevent oxidation of, said copper pigment upon drying; and d. drying said graphite pigmented coating.
Claim 8
Dependent Claim
99 words
A process of applying a conductive coating to an article for electromagnetic shielding electrostatic grounding purposes, said process comprising: a. coating said article with a metallic copper pigmented thermoplastic resin containing within the range of from about 25 to 40% by weight metallic copper pigment; b. drying said copper pigmented coating; c. coating said copper coating with a sufficient amount of a graphite pigmented water-dispersed resin containing within the range of from about 20 to 40% by weight carbon as graphite to cover, and prevent oxidation of, said copper pigment upon drying; and d. drying said graphite pigmented coating.
Claim 9
Dependent Claim
32 words
A process according to claim 6 wherein said article is coated with a sufficient amount of said metallic copper pigmented thermoplastic resin to provide a pigment particle to particle contact upon drying.
Claim 10
Dependent Claim
34 words
A process according to claim 6 wherein said article is coated with a sufficient amount of said metallic copper pigmented thermoplastic resin to provide a dried coating thickness of at least about 3 mils.
Claim 11
Dependent Claim
34 words
A process according to claim 8 wherein said copper coating is coated with a sufficient amount of said graphite pigmented water-dispersed resin to provide a dried graphite coating of at least about 1 mil.
Claim 12
Dependent Claim
13 words
A process according to claim 9 wherein said thermoplastic resin is ethyl celluLose.
Claim 13
Dependent Claim
15 words
A process according to claim 10 wherein said water-dispersed resin is comprised of vinyl acetate.
Claim 14
Dependent Claim
26 words
A process according to claim 9 wherein said copper pigmented resin contains within the range of from about 5 to 15% by weight thermoplastic resin binder.
Claim 15
Dependent Claim
26 words
A process according to claim 12 wherein said graphite pigmented resin contains within the range of from about 8 to 20% by weight water-dispersed resin binder.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |