US4121105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionization detector
Assignee: ELEKTROWATT AG A CORP OF SWITZERLAND
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Filing: 1976-11-08
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Granted: 1978-10-17
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Expires: 1996-11-08
Abstract
Abstract An ionization detecting fire alarm device that comprises a double chamber structure, a source disposed in at least one of the chambers and a vernier adjusting screw electrode protruding into one chamber. The chamber containing the adjustable electrode is more open to the atmosphere than the other chamber. Porting is provided between chambers and detection occurs by sensing the rate of change of ionization current in the chamber structure. The source or sources, one being in each chamber, is a beta source such as a nickel 63 source. A change in ionization current is detected by a unique circuit of this invention which comprises a programmable unijunction transistor oscillator circuit.
Inventors
- 👤 Elias E. Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:29
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/02; H01J41/08; G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
114 words
An ionization detector comprising; a chamber structure including means defining a first chamber, means defining a second chamber having means for receiving gases from external of the second chamber, and common boundary means between chambers including a common electrode, one electrode associated with said second chamber, another electrode within the first chamber defining a third chamber within the first chamber and being at least partially open to provide an ionization path between the first and third chambers, means including a radioactive source disposed in at least the second chamber for establishing an ionization current in the chamber structure, and means coupled from at least the common electrode for detecting changes in the ionization current.
Claim 2
Dependent Claim
114 words
An ionization detector comprising; a chamber structure including means defining a first chamber, means defining a second chamber having means for receiving gases from external of the second chamber, and common boundary means between chambers including a common electrode, one electrode associated with said second chamber, another electrode within the first chamber defining a third chamber within the first chamber and being at least partially open to provide an ionization path between the first and third chambers, means including a radioactive source disposed in at least the second chamber for establishing an ionization current in the chamber structure, and means coupled from at least the common electrode for detecting changes in the ionization current.
Claim 3
Dependent Claim
42 words
An ionization detector as set forth in claim 1 wherein said means defining a first chamber and said means defining a second chamber each comprise a cap means that join at open ends to define the outer boundaries of the chamber structure.
Claim 4
Dependent Claim
29 words
An ionization detector as set forth in claim 2 including means for conductively intercoupling the cap means and means for maintaining the both cap means at the same potential.
Claim 5
Dependent Claim
18 words
An ionization detector as set forth in claim 3 wherein said cap means each include a mesh cap.
Claim 6
Dependent Claim
25 words
An ionization detector as set forth in claim 2 wherein said common boundary means comprises a circuit board having means for receiving said cap means.
Claim 7
Dependent Claim
24 words
An ionization detector as set forth in claim 5 wherein said another electrode comprises an open frame having legs received by the circuit board.
Claim 8
Dependent Claim
28 words
An ionization detector as set forth in claim 1 including an adjustable particle capturing member extending at least partially into the chamber structure for adjusting the ionization current.
Claim 9
Dependent Claim
26 words
An ionization detector as set forth in claim 7 including support means for the adjustable member for supporting the member for movement into the third chamber.
Claim 10
Dependent Claim
22 words
An ionization detector as set forth in claim 8 wherein said another electrode has an aperture for receiving an elongated adjustable member.
Claim 11
Dependent Claim
21 words
An ionization detector as set forth in claim 9 wherein the means for supporting the adjustable member includes an insulating means.
Claim 12
Dependent Claim
19 words
An ionization detector as set forth in claim 2 wherein said cap means form a hexagonally shaped chamber structure.
Claim 13
Dependent Claim
135 words
An ionization detector comprising; means defining a chamber having port means for receiving gases from outside of the chamber, fixed position electrodes associated with and at least in part defining the chamber and spaced from one another, means including a radioactive source disposed in the chamber for establishing an ionization current in the chamber between the electrodes, an adjustable particle capturing member contained in the chamber between the fixed electrodes and movable to alter the ionization current, means for supporting the particle capturing member with said member having an end extending through one of said electrodes into the chamber, the area of said end within the chamber being variable to vary the number of particles captured thereby finely adjusting the ionization current, and means coupled from the electrodes for detecting changes in the ionization current.
Claim 14
Dependent Claim
135 words
An ionization detector comprising; means defining a chamber having port means for receiving gases from outside of the chamber, fixed position electrodes associated with and at least in part defining the chamber and spaced from one another, means including a radioactive source disposed in the chamber for establishing an ionization current in the chamber between the electrodes, an adjustable particle capturing member contained in the chamber between the fixed electrodes and movable to alter the ionization current, means for supporting the particle capturing member with said member having an end extending through one of said electrodes into the chamber, the area of said end within the chamber being variable to vary the number of particles captured thereby finely adjusting the ionization current, and means coupled from the electrodes for detecting changes in the ionization current.
Claim 15
Dependent Claim
28 words
An ionization detector as set forth in claim 12 including at least two chambers having a common electrode therebetween, said particle capturing electrode extending toward said common electrode.
Claim 16
Dependent Claim
29 words
An ionization detector as set forth in claim 13 wherein one of said electrodes is disposed within one of the two chambers to thereby define a third chamber therein.
Claim 17
Dependent Claim
22 words
An ionization detector as set forth in claim 14 wherein said one electrode defining the third chamber is at least partially open.
Claim 18
Dependent Claim
24 words
An ionization detector as set forth in claim 15 wherein said one electrode is cap-shaped having an opening for receiving the particle capturing member.
Claim 19
Dependent Claim
117 words
An ionization detector comprising; a chamber structure including at least two chambers one of which is a detection chamber for receiving gases or particles, common boundary means between chambers including a common electrode, said one chamber having an electrode extending between ends of the one chamber in part defining the one chamber, and terminating at the common boundary means, said other chamber having an electrode extending between ends of the other chamber in part defining the other chamber and also terminating at the common boundary means, the electrodes of both chambers being spaced from said common electrode, and means including a radioactive source disposed in the chamber structure for establishing an ionization current in the chamber structure.
Claim 20
Dependent Claim
117 words
An ionization detector comprising; a chamber structure including at least two chambers one of which is a detection chamber for receiving gases or particles, common boundary means between chambers including a common electrode, said one chamber having an electrode extending between ends of the one chamber in part defining the one chamber, and terminating at the common boundary means, said other chamber having an electrode extending between ends of the other chamber in part defining the other chamber and also terminating at the common boundary means, the electrodes of both chambers being spaced from said common electrode, and means including a radioactive source disposed in the chamber structure for establishing an ionization current in the chamber structure.
Claim 21
Dependent Claim
28 words
An ionization detector as set forth in claim 17 wherein said electrodes of said chambers are each cap-shaped and together define the major portion of the chamber structure.
Claim 22
Dependent Claim
32 words
An ionization detector as set forth in claim 18 including an additional electrode in said other chamber and being at least partially open to provide an ionization path to the cap-shaped electrode.
Claim 23
Dependent Claim
28 words
An ionization detector as set forth in claim 19 including an adjustable particle capturing member extending at least partially into the chamber structure for adjusting the ionization current.
Claim 24
Dependent Claim
29 words
An ionization detector as set forth in claim 20 wherein said adjustable particle capturing member extends through at least said additional electrode in a direction toward the common electrode.
Claim 25
Dependent Claim
19 words
An ionization detector as set forth in claim 18 wherein both cap-shaped electrodes are of a wire mesh construction.
Claim 26
Dependent Claim
94 words
An ionizaton detector comprising; a chamber structure including means defining a first chamber, means defining a second chamber, having means for receiving gases from external of the second chamber, and common boundary means between chambers including a common electrode, one electrode associated with said second chamber, another electrode within the first chamber defining a third chamber within the first chamber and being at least partially open to provide an ionization path between the first and third chambers, and means including a radioactive source disposed in the chamber structure for establishing an ionization current therein.
Claim 27
Dependent Claim
94 words
An ionizaton detector comprising; a chamber structure including means defining a first chamber, means defining a second chamber, having means for receiving gases from external of the second chamber, and common boundary means between chambers including a common electrode, one electrode associated with said second chamber, another electrode within the first chamber defining a third chamber within the first chamber and being at least partially open to provide an ionization path between the first and third chambers, and means including a radioactive source disposed in the chamber structure for establishing an ionization current therein.
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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |