US5133087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminate having indicator function
Assignee: Hitachi Ltd
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Filing: 1990-12-18
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Granted: 1992-07-28
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Expires: 2010-12-18
Abstract
Abstract A laminate comprising an inner layer containing an acid/base indicator and an outer layer containing no acid/base indicator, wherein the inner layer is capable of undergoing a color change upon its contact with an acid or an alkali.
Inventors
- 👤 Morihisa Machida
- 👤 Yoshio Tajima
- 👤 Hideo Nakatsumi
- 👤 Tatsuo Isahai
- 👤 Daijiro Shiroki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:35
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/45; A61F13/47; A61F13/42; B; B32; B32B; B32B7/00; B32B7/02; G; G01; G01N; G01N31/00; G01N31/22; G01N31/221
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
A thin working glove for use in the production of electronic parts and elements comprising a laminate having a function of an indicator, the laminate comprising an acrylonitrile-butadiene rubber inner layer which contains an acid/base indicator which changes color upon contact with acid or an alkali and an outer layer of a material selected from the group consisting of chlorinated-polyethylene, chlorosulfonated polyethylene and butyl rubber, said outer layer being adapted to be furthest away from the wearer.
Claim 2
Dependent Claim
77 words
A thin working glove for use in the production of electronic parts and elements comprising a laminate having a function of an indicator, the laminate comprising an acrylonitrile-butadiene rubber inner layer which contains an acid/base indicator which changes color upon contact with acid or an alkali and an outer layer of a material selected from the group consisting of chlorinated-polyethylene, chlorosulfonated polyethylene and butyl rubber, said outer layer being adapted to be furthest away from the wearer.
Claim 3
Dependent Claim
18 words
A glove as claimed in claim 1, wherein said acid/base indicator is phenolphthalein, methyl orange or Congo red.
Claim 4
Dependent Claim
22 words
A glove as claimed in claim 1, wherein said inner layer comprises a plurality of layers each containing a different acid/base indicator.
Claim 5
Dependent Claim
32 words
A glove as claimed in claim 1 wherein said inner layer has been made by blending said acid/base indicator with a latex of said acrylonitrile-butadiene rubber; and solidifying said blend by drying.
Claim 6
Dependent Claim
26 words
A glove as claimed in claim 1 containing 0.5 to 1.5 parts by weight of said indicator per 100 parts by weight of said acrylonitrile-butadiene rubber.
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-28 | 1996-01-27 | 1996-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-28 | 2000-01-27 | 2000-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-28 | 2004-01-27 | 2004-07-28 | $7700.00 | Window Closed / Lapsed |