Patent US5534576A successfully refreshed from Google Patents.
US5534576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealant for electrochemical cells
Assignee: EIDP Inc
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Filing: 1990-04-17
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Granted: 1996-07-09
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Expires: 2010-04-17
Abstract
Abstract A sealant composition comprises a dispersion of a fluorocarbon polymer with particles no larger than 25 micrometers in a low volatility liquid and up to 50 percent of a higher volatility liquid. Also covered is an applicator for applying the sealant to the gasket of an electrochemical cell.
Inventors
- 👤 Walther G. Grot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:37
CPC Classifications
B; B05; B05C; B05C17/00; B05C17/005; B05C17/00503; B05C17/00516; B05C17/01
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
97 words
A sealant composition comprising (a) 20-50 weight % fluoropolymer on a dry basis, (b) the fluoropolymer having particles with a diameter no greater than 25 micrometers, and (c) 0-5 weight % thickener dispersed in an amount of a single phase liquid medium chosen to add to 100 weight %, (d) the liquid medium comprising 50-100 weight % of a low-volatility liquid wherein the low-volatility liquid has a boiling point at 5 mm Hg of at least 50° C. and 0-50% of a more volatile liquid, and (e) wherein said composition has a viscosity of about 10-5000 poises.
Claim 2
Dependent Claim
97 words
A sealant composition comprising (a) 20-50 weight % fluoropolymer on a dry basis, (b) the fluoropolymer having particles with a diameter no greater than 25 micrometers, and (c) 0-5 weight % thickener dispersed in an amount of a single phase liquid medium chosen to add to 100 weight %, (d) the liquid medium comprising 50-100 weight % of a low-volatility liquid wherein the low-volatility liquid has a boiling point at 5 mm Hg of at least 50° C. and 0-50% of a more volatile liquid, and (e) wherein said composition has a viscosity of about 10-5000 poises.
Claim 3
Dependent Claim
21 words
The sealant of claim 1 wherein the ratio of weight % low-volatility liquid to weight % fluoropolymer is at least 1:2.
Claim 4
Dependent Claim
25 words
The sealant of claim 1 wherein the low-volatility liquid is 75-95 weight % of the liquid medium and the higher-volatility liquid is 5-25 weight %.
Claim 5
Dependent Claim
11 words
The sealant of claim 1 wherein the higher-volatility liquid is water.
Claim 6
Dependent Claim
16 words
The sealant of claim 1 wherein the fluoropolymer particles are at most 10 micrometers in diameter.
Claim 7
Dependent Claim
16 words
The sealant of claim 5 wherein the fluoropolymer particles are at most 1 micrometer in diameter.
Claim 8
Dependent Claim
34 words
The sealant of claim 6 wherein the fluoropolymer is a copolymer of tetrafluoroethylene and at least one of (a) a terminal perfluoroolefin of 3-10 carbons and (b) a perfluorovinyl perfluoroalkyl ether of 3-10 carbons.
Claim 9
Dependent Claim
17 words
The sealant of claim 1 wherein the low-volatility liquid is a polyethylene glycol or an ether thereof.
Claim 10
Dependent Claim
15 words
The sealant of claim 1 wherein the thickener is an emulsion of an acrylic polymer.
Claim 11
Dependent Claim
18 words
The sealant of claim 11 having a pH during storage and at the time of application of 6.5-7.
Claim 12
Dependent Claim
11 words
The sealant of claim 10 wherein the sealant thickens after application.
Claim 13
Dependent Claim
19 words
The sealant of claim 10 wherein sufficient sodium bicarbonate is used to raise the pH to 6.5 to 7.
Claim 14
Dependent Claim
14 words
The sealant of claim 12 wherein bromthymol blue is added as a pH indicator.
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) | 1999-07-09 | 2000-01-08 | 2000-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-09 | 2004-01-08 | 2004-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-09 | 2008-01-08 | 2008-07-09 | $7700.00 | Window Closed / Lapsed |