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US5290702A
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Method of detecting and mapping organic solvent-containing materials on a surface
Assignee: Valence Technology Inc
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Filing: 1993-03-19
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Granted: 1994-03-01
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Expires: 2013-03-19
Abstract
Abstract Chromogenic solvent detectors are used to detect and map the presence of organic solvent-containing materials on a surface. The detector need only be applied to the surface to be tested. When removed, the dark areas on the detector correspond to those areas of the surface where an organic solvent-containing material was present. This method can be used to test the release properties of a release film.
Inventors
- 👤 On-Kok Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:58
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/98; G01N31/00; G01N31/22; Y; Y10; Y10T; Y10T436/00; Y10T436/14; Y10T436/141111; Y10T436/145555; Y10T436/147777; Y10T436/20; Y10T436/200833; Y10T436/202499; Y10T436/203332; Y10T436/204165
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
118 words
A method for detecting and mapping organic solvent-containing materials on a surface using a chromogenic solvent detector which comprises: a substrate; a binder means which is substantially soluble to said solvent; an electron donating chromogenic composition dispersed on said substrate in connection with said binder means; and an electron accepting composition, which forms a color with said chromogenic composition, dispersed on said substrate in connection with said binder means, said method comprising the steps of contacting said surface with said detector, dissolving said binder means of said detector in a region of contact with said organic solvent-containing material, and detecting a visual discoloration of said detector caused by the contact of said organic solvent-containing material with said detector.
Claim 2
Independent Claim
118 words
A method for detecting and mapping organic solvent-containing materials on a surface using a chromogenic solvent detector which comprises: a substrate; a binder means which is substantially soluble to said solvent; an electron donating chromogenic composition dispersed on said substrate in connection with said binder means; and an electron accepting composition, which forms a color with said chromogenic composition, dispersed on said substrate in connection with said binder means, said method comprising the steps of contacting said surface with said detector, dissolving said binder means of said detector in a region of contact with said organic solvent-containing material, and detecting a visual discoloration of said detector caused by the contact of said organic solvent-containing material with said detector.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein said surface is directly contacted with said chromogenic solvent detector.
Claim 4
Dependent Claim
16 words
The method of claim 1, wherein said surface is indirectly contacted with said chromogenic solvent detector.
Claim 5
Dependent Claim
24 words
The method of claim 3, wherein said indirect contact comprises transferring said solvent-containing materials to said chromogenic solvent detector with an inert transfer means.
Claim 6
Dependent Claim
13 words
The method of claim 4, wherein said inert transfer means comprises filter paper.
Claim 7
Dependent Claim
48 words
The method of claim 4, wherein said inert transfer means comprises a first inert transfer means in direct contact with said surface to transfer the organic solvent-containing material to said detector and a second inert transfer means used to withdraw extraneous materials from said first inert transfer means.
Claim 8
Dependent Claim
25 words
The method of claim 6, wherein said first inert transfer means comprises a microporous material, and wherein said second inert transfer means comprises filter paper.
Claim 9
Dependent Claim
14 words
The method of claim 1, wherein said surface comprises a film of release material.
Claim 10
Dependent Claim
24 words
The method of claim 1, wherein said organic solvent-containing material comprises at least one polar solvent having a dielectric constant greater than about 8.
Claim 11
Dependent Claim
17 words
The method of claim 9, wherein said polar solvent has a dielectric constant greater than about 12.
Claim 12
Dependent Claim
17 words
The method of claim 10, wherein said polar solvent has a dielectric constant greater than about 16.
Claim 13
Dependent Claim
31 words
The method of claim 9, wherein said polar solvent is selected from the group consisting of alcohol, glycol, polyol, aldehyde, carbonate, acetone, ester, ether, ketone, dimethylsulfoxide, dioxolane, sulfolane, butyrolactone, and tetrahydrofuran.
Claim 14
Dependent Claim
15 words
The method of claim 12, wherein said alcohol contains less than about 8 carbon atoms.
Claim 15
Dependent Claim
15 words
The method of claim 12, wherein said ketone contains less than about 6 carbon atoms.
Claim 16
Dependent Claim
15 words
The method of claim 12, wherein said esters contains less than about 8 carbon atoms.
Claim 17
Dependent Claim
13 words
The method of claim 1, wherein said organic solvent-containing material comprises an electrolyte.
Claim 18
Dependent Claim
23 words
The method of claim 1, wherein said detector comprises at least one electron donating dye precursor and at least one electron accepting compound.
Claim 19
Dependent Claim
12 words
The method of claim 12, wherein said detector consists of thermal paper.
Claim 20
Dependent Claim
44 words
A method of testing the release properties of a release material comprising contacting a surface which was previously in contact with an organic solvent-containing material and detecting the presence of an organic solvent adhered to said surface by the method according to claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |