US5958787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer sensor
Assignee: Ticona GmbH
•
Filing: 1995-11-03
•
Granted: 1999-09-28
•
Expires: 2015-11-03
Abstract
Abstract A sensor for oxidizing agents contains an oxidizable aromatic polymer. The sensor comprises a piezoelectric crystal coated with a porous or non-porous layer that contains the oxidizable aromatic polymer.
Inventors
- 👤 Axel Schonfeld
- 👤 Gernot Feucht
- 👤 Andreas Schleicher
- 👤 Georg Frank
- 👤 Heinz Rieger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:18
CPC Classifications
G; G01; G01N; G01N27/00; G01N29/00; G01N29/02; G01N29/022; G01N29/036; G01N2291/00; G01N2291/02; G01N2291/025; G01N2291/0256; G01N2291/028; G01N2291/02818; G01N2291/04; G01N2291/042; G01N2291/0423; G01N2291/0426; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/177692; Y10T436/20; Y10T436/206664
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
37 words
A sensor for oxidating agents, which comprises a piezoelectric crystal having a plurality of layers on a surface thereof, including an intermediate layer and an outer layer, said outer layer comprising at least one oxidizable aromatic polymer.
Claim 2
Dependent Claim
37 words
A sensor for oxidating agents, which comprises a piezoelectric crystal having a plurality of layers on a surface thereof, including an intermediate layer and an outer layer, said outer layer comprising at least one oxidizable aromatic polymer.
Claim 3
Dependent Claim
17 words
The sensor as claimed in claim 1, wherein said outer layer comprises porous oxidizable aromatic polymer particles.
Claim 4
Dependent Claim
27 words
The sensor as claimed in claim 1 wherein a said intermediate layer comprises a polymer having pendant olefinic groups or polybutadiene, polyisoprene, polyacrylate, polymethacrylate, polystyrene or polysiloxane.
Claim 5
Dependent Claim
27 words
The sensor as claimed in claim 1, wherein said piezoelectric crystal is an alkaline earth metal titanate crystal, a lead zirconium titanate crystal or a quartz crystal.
Claim 6
Dependent Claim
147 words
The sensor as claimed in claim 1, wherein a said oxidizable aromatic polymer is a substituted polyarylene having repeating units of the general formula (I) (Ar.sup.1).sub.n --X!.sub.m -- (Ar.sup.2).sub.i --Y!.sub.j -- (Ar.sup.3).sub.k --Z!.sub.1 -- (Ar.sup.4).sub.o --W!.sub.p --(I) in which Ar 1 , Ar 2 , Ar 3 , Ar 4 , W, X, Y and Z, independently of one another, are identical or different; Ar 1 , Ar 2 , Ar 3 and Ar 4 are o-substituted or unsubstituted arylene groups having 6 to 18 carbon atoms, and W, X, Y and Z are --SO 2 --, --S--, --SO--, --CO--, --O--, --CO 2 -- or alkylene or alkylidene having 1 to 6 carbon atoms; and the indices n, m, i, j, k, l, o and p, independently of one another, are zero or a number from 1 to 4, and their sum must be at least 2.
Claim 7
Dependent Claim
23 words
The sensor as claimed in claim 5, wherein at least one of the groups W, X, Y or Z is --O-- or --S--.
Claim 8
Dependent Claim
21 words
The sensor as claimed in claim 5, wherein the layer comprising at least one oxidizable aromatic polymer comprises a porous coating.
Claim 9
Dependent Claim
32 words
The sensor as claimed in claim 5, wherein a said oxidizable aromatic polymer is oxidized, sufficiently for gas analysis purposes, by ozone, an oxide of nitrogen, a peroxide or a per acid.
Claim 10
Dependent Claim
20 words
The sensor as claimed in claim 1, wherein said oxidizable aromatic polymer is a sulfur-containing polymer or a polyarylene ether.
Claim 11
Dependent Claim
15 words
The sensor as claimed in claim 9, wherein said sulfur-containing polymer is a polyarylene thioether.
Claim 12
Dependent Claim
18 words
The sensor as claimed in claim 10, wherein said polyarylene thioether is a linear or branched polyphenylene sulfide.
Claim 13
Dependent Claim
14 words
The sensor as claimed in claim 9, wherein said polyarylene ether comprises poly-p-(2,6-dimethylphenylene oxide).
Claim 14
Dependent Claim
28 words
A gas analysis device comprising a flow cell containing gas sensor as claimed in claim 1 and an oscillator in a direct testing relationship with said gas sensor.
Claim 15
Dependent Claim
26 words
A method for analyzing for an oxidizing agent comprising the step of bringing the oxidizing agent into contact with a sensor as claimed in claim 1.
Claim 16
Dependent Claim
22 words
The method as claimed in claim 14, wherein the oxidizing agent is ozone, a nitrogen oxide, a peroxide or a per acid.
Claim 17
Dependent Claim
83 words
A process for the preparation of a gas sensor for gas analysis from a piezoelectric crystal, said process comprising: a) immersing the crystal in a solution containing a oxidizing agent-sensing polymer and a solvent therefor; b) immersing the thus-immersed crystal in a nonsolvent for said oxidizing agent-sensing polymer until substantially all of said solvent has been replaced by said nonsolvent, and c) removing said nonsolvent by drying such that said oxidizing agent-sensing polymer remains on the surface of the crystal in porous form.
Claim 18
Dependent Claim
83 words
A process for the preparation of a gas sensor for gas analysis from a piezoelectric crystal, said process comprising: a) immersing the crystal in a solution containing a oxidizing agent-sensing polymer and a solvent therefor; b) immersing the thus-immersed crystal in a nonsolvent for said oxidizing agent-sensing polymer until substantially all of said solvent has been replaced by said nonsolvent, and c) removing said nonsolvent by drying such that said oxidizing agent-sensing polymer remains on the surface of the crystal in porous form.
Claim 19
Dependent Claim
82 words
A process for the preparation of a gas sensor for gas analysis from a piezoelectric crystal, said process comprising.: a) immersing the crystal in a solution containing a polymer having an adhesive action, b) drying the thus-immersed crystal, c) immersing the thus-dried crystal in a suspension containing porous particles of an oxidizing agent-sensing polymer, and d) drying the thus-immersed crystal until said porous particles are bonded to surfaces of the crystal by an intermediate layer comprising said polymer having an adhesive action.
Claim 20
Dependent Claim
82 words
A process for the preparation of a gas sensor for gas analysis from a piezoelectric crystal, said process comprising.: a) immersing the crystal in a solution containing a polymer having an adhesive action, b) drying the thus-immersed crystal, c) immersing the thus-dried crystal in a suspension containing porous particles of an oxidizing agent-sensing polymer, and d) drying the thus-immersed crystal until said porous particles are bonded to surfaces of the crystal by an intermediate layer comprising said polymer having an adhesive action.
Claim 21
Dependent Claim
22 words
The process as claimed in claim 17, wherein said polymer having an adhesive action is polybutadiene, polyisoprene, polyacrylate, polymethacrylate, polystyrene or polysiloxane.
References Cited (Backward Citations)
US3427864A
Cited
US3327519A
Cited
US3879992A
Cited
US4111036A
Cited
JPH0599827A
Cited
JPH06129973A
Cited
US5423902A
Cited
US5866798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-09-27 | 2003-03-29 | 2003-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-09-27 | 2007-03-29 | 2007-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-09-27 | 2011-03-29 | 2011-09-28 | $7700.00 | Window Closed / Lapsed |