US5866798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal oscillator sensor
Assignee: Celanese Sales Germany GmbH
•
Filing: 1996-04-04
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Granted: 1999-02-02
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Expires: 2016-04-04
Abstract
Abstract The crystal oscillator sensor is provided with a coating comprising a polymer having olefinic side groups. The coating polymer used is, for example, substituted polyacrylate, polymethacrylate, polystyrene or polyester. The sensor is suitable for detecting ozone.
Inventors
- 👤 Axel Schonfeld
- 👤 Gernot Feucht
- 👤 George Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:42
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/02; G01N29/036; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0036; G01N33/0039; G01N2291/00; G01N2291/02; G01N2291/025; G01N2291/0256; G01N2291/0257; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
32 words
A sensor comprising a piezoelectric crystal having olefinic side groups, and wherein the polymer having olefinic side groups is selected from the group consisting of a substituted polyacrylate, polymethacrylate, polystyrene and polyester.
Claim 2
Dependent Claim
32 words
A sensor comprising a piezoelectric crystal having olefinic side groups, and wherein the polymer having olefinic side groups is selected from the group consisting of a substituted polyacrylate, polymethacrylate, polystyrene and polyester.
Claim 3
Dependent Claim
24 words
A sensor as claimed in claim 1, wherein the polymer having olefinic side groups is a copolymer containing at least 3% olefinic side groups.
Claim 4
Dependent Claim
26 words
A sensor as claimed in claim 1, wherein the polymer has a mean molecular weight in the range from 2 000 to 10 000 000 g/mol.
Claim 5
Dependent Claim
27 words
A sensor as claimed in of claim 1, wherein the piezoelectric crystal has a fundamental vibration in a frequency range of from 20 kHz to 100 MHz.
Claim 6
Dependent Claim
31 words
A sensor as claimed in claim 1, wherein the piezoelectric crystal has a harmonic vibration or a surface acoustic wave vibration in the frequency range from 20 kHz to 1000 MHz.
Claim 7
Dependent Claim
29 words
A sensor as claimed in claim 1, wherein the piezoelectric crystal used is selected from the group consisting of an alkaline earth metal titanate, lead zirconate titanate and quartz.
Claim 8
Dependent Claim
32 words
A sensor comprising a piezoelectric crystal having a coating comprising a polymer having olefinic side groups, and wherein the polymer having olefinic side groups is a polymer of the formula (I) ##STR2##
Claim 9
Dependent Claim
32 words
A sensor comprising a piezoelectric crystal having a coating comprising a polymer having olefinic side groups, and wherein the polymer having olefinic side groups is a polymer of the formula (I) ##STR2##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-01 | 2002-08-03 | 2003-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-01 | 2006-08-03 | 2007-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-01 | 2010-08-03 | 2011-02-02 | $7700.00 | Window Closed / Lapsed |