Patent US4810418A successfully refreshed from Google Patents.
US4810418A
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Electrically conductive composition
Assignee: 3M Co
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Filing: 1987-03-23
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Granted: 1989-03-07
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Expires: 2007-03-23
Abstract
Abstract A substantially water and salt free electrically conductive composition used to assure good electrical conductivity between two points. The composition remains moist (i.e., it does not dry or harden) over an extended period of time.
Inventors
- 👤 Richard W. Burvee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:25
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; A; A61; A61K; A61K47/00; A61K47/30; A61K47/32
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
147 words
An electrically conductive composition which contains less than 10% by weight water and less than 0.001% by weight salt and which comprises a mixture of at least one polyhydric alcohol selected from the group consisting of propylene glycol, ethylene glycol, glycerol, 1,2,4 butane triol, and polyethylene glycol and at least 1 part by weight per 100 parts by weight of said alcohol of a thickener selected from the group consisting of polymers having at least 2 mole % of said acid anhydride units, wherein said thickener results from the polymerization of an addition polymerizable acid anhydride and an olefinic, addition polymerizable monomer free from anhydride functionality, wherein said addition polymerizable acid anhydride is selected from th group consisting of actice anhydride and maleic anhydride and said olefinic, addition polymerizable monomer is selected from acrylate esters, vinyl ethers, vinyl acrylates, olefins, olefinic polycarboxylic acid esters, and vinyl halides.
Claim 2
Dependent Claim
147 words
An electrically conductive composition which contains less than 10% by weight water and less than 0.001% by weight salt and which comprises a mixture of at least one polyhydric alcohol selected from the group consisting of propylene glycol, ethylene glycol, glycerol, 1,2,4 butane triol, and polyethylene glycol and at least 1 part by weight per 100 parts by weight of said alcohol of a thickener selected from the group consisting of polymers having at least 2 mole % of said acid anhydride units, wherein said thickener results from the polymerization of an addition polymerizable acid anhydride and an olefinic, addition polymerizable monomer free from anhydride functionality, wherein said addition polymerizable acid anhydride is selected from th group consisting of actice anhydride and maleic anhydride and said olefinic, addition polymerizable monomer is selected from acrylate esters, vinyl ethers, vinyl acrylates, olefins, olefinic polycarboxylic acid esters, and vinyl halides.
Claim 3
Dependent Claim
16 words
A composition according to claim 1 having an electrical resistivity of less than 5×10 6 ohm-cm.
Claim 4
Dependent Claim
17 words
A composition according to claim 2 having a pH in the range of from 3 to 7.
Claim 5
Dependent Claim
25 words
A composition according to claim 3 containing at most 10 parts by weight of said thickener per 100 parts by weight of said polyhydric alcohol.
Claim 6
Dependent Claim
16 words
A composition according to claim 2 wherein said polyhydric alcohol is normally liquid at 20° C.
Claim 7
Dependent Claim
22 words
A composition according to claim 5 wherein said polyhydric alcohol is selected from the group consisting of ethylene glycol and propylene glycol.
Claim 8
Dependent Claim
13 words
A composition according to claim 6 wherein said polyhydric alcohol is ethylene glycol.
Claim 9
Dependent Claim
13 words
A composition according to claim 6 wherein said polyhydric alcohol is propylene glycol.
Claim 10
Dependent Claim
25 words
A composition according to claim 1 wherein said addition polymerizable acid anhydride is maleic anhydride and said olefinic, addition polymerizable monomer is a vinyl ether.
Claim 11
Dependent Claim
24 words
A composition according to claim 9 wherein said thickener comprises a copolymer of approximately equal parts of said vinyl ether and said maleic anhydride.
Claim 12
Dependent Claim
15 words
A composition according to claim 10 wherein said vinyl ether is a methyl vinyl ether.
Claim 13
Dependent Claim
28 words
An electrically conductive composition ccording to claim 1 which has an electrical resistivity of less than 5×10 6 ohm-cm and a pH of from 3 to 7 .
Claim 14
Dependent Claim
6 words
A gel according to claim 1.
Claim 15
Dependent Claim
7 words
A non-drying gel according to claim 1.
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) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |