Patent US4321038A successfully refreshed from Google Patents.
US4417228A
Expired / Lapsed
US
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Gas component detector
Assignee: Niterra Co Ltd
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Filing: 1982-05-06
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Granted: 1983-11-22
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Expires: 2002-05-06
Abstract
Abstract A gas component detector having a gas component detecting element made of sintered metal oxide for indicating an electrical resistance according to the components of a gas to be detected. A pair of electrodes transmit the electrical resistance indicated by the gas component detecting element and a ceramic tube has through-holes into which said pair of electrodes are inserted. The ceramic tube has a cylindrical ceramic heater which is prepared by having a piece of wet ceramic sheet on which a print pattern is formed with metal paste for forming a heat generator wound on and bonded to the outer wall of the ceramic tube before sintering. The heater is then sintered to be integral with the ceramic tube.
Inventors
- 👤 Akio Takami
- 👤 Tsutomu Saito
- 👤 Toshifumi Sekiya
- 👤 Kazutoshi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:14
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
In a gas component detector having: a gas component detecting element made of sintered metal oxide with a varying electrical resistance according to the components of a gas to be detected; a pair of electrodes for transmitting the electrical resistance of said gas component detecting element; and a ceramic tube having through-holes into which said pair of electrodes are inserted, the improvement comprising a method of making said ceramic tube with a cylindrical ceramic heater comprising the steps of; forming on a green ceramic sheet a print pattern with metal paste for forming a heat generator; winding and bonding said sheet to the outer wall of said ceramic tube before sintering; and co-fired to integrate said heater with said ceramic tube.
Claim 2
Dependent Claim
121 words
In a gas component detector having: a gas component detecting element made of sintered metal oxide with a varying electrical resistance according to the components of a gas to be detected; a pair of electrodes for transmitting the electrical resistance of said gas component detecting element; and a ceramic tube having through-holes into which said pair of electrodes are inserted, the improvement comprising a method of making said ceramic tube with a cylindrical ceramic heater comprising the steps of; forming on a green ceramic sheet a print pattern with metal paste for forming a heat generator; winding and bonding said sheet to the outer wall of said ceramic tube before sintering; and co-fired to integrate said heater with said ceramic tube.
Claim 3
Dependent Claim
124 words
A gas component detector comprising: a gas component detecting element made of sintered metal oxide with a varying electrical resistance according to the components of a gas to be detected; a pair of electrodes for transmitting the electrical resistance of said gas component detecting element; a ceramic tube having through-holes into which said pair of electrodes are inserted; and a cylindrical ceramic heater integral with said ceramic tube and comprising a green ceramic sheet having printed thereon a pattern for heat generator defined by a metal paste, said sheet wound on and bonded to the outer wall of said ceramic tube prior to sintering followed by sintering of said tube having said sheet wound around it to integrate said heater with said ceramic tube.
Claim 4
Dependent Claim
124 words
A gas component detector comprising: a gas component detecting element made of sintered metal oxide with a varying electrical resistance according to the components of a gas to be detected; a pair of electrodes for transmitting the electrical resistance of said gas component detecting element; a ceramic tube having through-holes into which said pair of electrodes are inserted; and a cylindrical ceramic heater integral with said ceramic tube and comprising a green ceramic sheet having printed thereon a pattern for heat generator defined by a metal paste, said sheet wound on and bonded to the outer wall of said ceramic tube prior to sintering followed by sintering of said tube having said sheet wound around it to integrate said heater with said ceramic tube.
Claim 5
Dependent Claim
43 words
A gas component detector as in claim 2, comprising a portion of said gas component detecting element exposed form one end face of said cylindrical ceramic heater, and wherein a wiring pattern defined by said print pattern is buried in said sintered ceramic.
Claim 6
Dependent Claim
44 words
A gas component detector as in claim 2, wherein said ceramic tube integral with said cylindrical ceramic heater has a recess in one end face thereof, and a portion of said gas component detecting element is fixedly secured to said recess with heat-resisting cement.
Claim 7
Dependent Claim
30 words
A gas component detector as in claims 2, 3, or 4, wherein said electrodes protrudes through an end face of said cylindrical ceramic heater into said gas component detecting element.
Claim 8
Dependent Claim
27 words
A gas component detector as in claim 2, further comprising a temperature compensating thermistor in an end of said ceramic tube integral with said cylindrical ceramic heater.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |