US4863694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemically sensitive component
Assignee: Siemens AG
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Filing: 1986-02-26
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Granted: 1989-09-05
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Expires: 2006-02-26
Abstract
Abstract The present invention is directed to a chemically sensitive component including an optical filter that reversibly changes color or transparency in response to a gas or vapor to be determined or detected. The optical filter comprises a mixture of a basic or acid color former or dye of the triphenyl methane system and a complementary acid or basic compound which may be embedded in a matrix and/or applied as a coating to a carrier. The optical filter's change in color or transparency can be measured photoelectronically, e.g., with a luminescent diode as a light source and a photodiode or a phototransistor as a light detector.
Inventors
- 👤 Heinrich Kimmel
- 👤 Bernhard Montag
- 👤 Walter Gumbrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:23
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/221; G01N21/00; G01N21/75; G01N21/77; G01N21/78; G01N21/783
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
114 words
A chemically sensitive component for measuring gases and vapors comprising a radiation emitting source, a detector means and an optical filter that reversibly changes color or transparency in response to a gas or vapor to be measured; said optical filter comprising a mixture of at least one compound selected from the group consisting of a basic color former or dye and an acid color former or dye and at least one compound selected from the group consisting of a complementary acid and complementary base; said optical filter being disposed so that radiation emitted from said source reaching said detector means is measurably altered by changes in the color or transparency of said optical filter.
Claim 2
Dependent Claim
114 words
A chemically sensitive component for measuring gases and vapors comprising a radiation emitting source, a detector means and an optical filter that reversibly changes color or transparency in response to a gas or vapor to be measured; said optical filter comprising a mixture of at least one compound selected from the group consisting of a basic color former or dye and an acid color former or dye and at least one compound selected from the group consisting of a complementary acid and complementary base; said optical filter being disposed so that radiation emitted from said source reaching said detector means is measurably altered by changes in the color or transparency of said optical filter.
Claim 3
Dependent Claim
31 words
The chemically sensitive component according to claim 1, wherein the optical filter is a mixture of at least one basic color former from the triphenyl methane system and a complementary acid.
Claim 4
Dependent Claim
22 words
The chemically sensitive component according to claim 2 wherein the mixture is applied to a carrier in the form of a coating.
Claim 5
Dependent Claim
16 words
The chemically sensitive component according to claim 2 wherein the mixture is embedded in a matrix.
Claim 6
Dependent Claim
22 words
The chemically sensitive component according to claim 2 wherein the change in color or transparency of the optical filter is measured photoelectronically.
Claim 7
Dependent Claim
23 words
The chemically sensitive component according to claim 1, wherein the acidic or basic color former is a triphenyl methane dye or sulfone phthalein.
Claim 8
Dependent Claim
22 words
The chemically sensitive component according to claim 6 wherein the mixture is applied to a carrier in the form of a coating.
Claim 9
Dependent Claim
16 words
The chemically sensitive component according to claim 6 wherein the mixture is embedded in a matrix.
Claim 10
Dependent Claim
22 words
The chemically sensitive component according to claim 6 wherein the change in color or transparency of the optical filter is measured photoelectronically.
Claim 11
Dependent Claim
22 words
The chemically sensitive component according to claim 1, wherein the mixture is applied to a carrier in the form of a coating.
Claim 12
Dependent Claim
22 words
The chemically sensitive component according to claim 10, wherein the change in color or transparency of the optical filter is measured photoelectronically.
Claim 13
Dependent Claim
25 words
The chemically sensitive component according to claim 11, wherein the radiation source is a luminescent diode and the detector means is a photodiode or phototransistor.
Claim 14
Dependent Claim
16 words
The chemically sensitive component according to claim 1 wherein the mixture is embedded in a matrix.
Claim 15
Dependent Claim
22 words
The chemically sensitive component according to claim 13, wherein the change in color or transparency of the optical filter is measured photoelectronically.
Claim 16
Dependent Claim
25 words
The chemically sensitive component according to claim 14, wherein the radiation source is a luminescent diode and the detector means is a photodiode or phototransistor.
Claim 17
Dependent Claim
22 words
The chemically sensitive component according to claim 1, wherein the change in color or transparency of the optical filter is measured photoelectronically.
Claim 18
Dependent Claim
25 words
The chemically sensitive component according to claim 16, wherein the radiation source is a luminescent diode and the detector means is a photodiode or phototransistor.
Claim 19
Dependent Claim
35 words
The chemically sensitive component according to claim 1, wherein the optical filter is a mixture of a triphenyl methane dye and a complementary acid selected from the group consisting of salicylic acid and bisphenol A.
Claim 20
Dependent Claim
26 words
The chemically sensitive component according to claim 1 wherein the acidic basic color former is selected from the group consisting of crystal violet and bromothymol blue.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |