US3849685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionization chamber with recessed radioactive body
Assignee: Honeywell Inc
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Filing: 1973-06-22
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Granted: 1974-11-19
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Expires: 1993-06-22
Abstract
Abstract An improved chamber assembly for an ionization smoke detector. The chamber assembly includes a cup shaped electrode having attached therein a radioactive source to provide the ionization in the chamber. The radioactive body which is retained in a rivet head container, or the like, is staked to the interior surface of the cup shaped electrode, and to make sure that the radioactive source or its container does not project out into the chamber area, the mounting point of the electrode is dimpled so that the face of the mounted radioactive rivet is substantially flush with the general contour of the interior surface of the electrode.
Inventors
- 👤 L Larsen
- 👤 A Kompelien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:46
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113; H; H01; H01J; H01J41/00; H01J41/02; H01J41/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
In an ionization smoke detector of the type having a smoke sensing chamber containing a radioactive source, an improved chamber assembly comprising in combination: a cup like electrode mounted on a base member and defining an exterior chamber wall of an ionizing chamber; a radioactive body for ionizing the area within said chamber, said body being mounted on the cup like electrode; a dimple like recess in said cup like electrode at the mounting point of said body which is effective to recess the body so the radiating face thereof is substantially flush with the inner surface of the cup like electrode whereby the uniformity of ion flow to the inner surface of the electrode is improved.
Claim 2
Dependent Claim
117 words
In an ionization smoke detector of the type having a smoke sensing chamber containing a radioactive source, an improved chamber assembly comprising in combination: a cup like electrode mounted on a base member and defining an exterior chamber wall of an ionizing chamber; a radioactive body for ionizing the area within said chamber, said body being mounted on the cup like electrode; a dimple like recess in said cup like electrode at the mounting point of said body which is effective to recess the body so the radiating face thereof is substantially flush with the inner surface of the cup like electrode whereby the uniformity of ion flow to the inner surface of the electrode is improved.
Claim 3
Dependent Claim
27 words
The invention according to claim 1 in which said dimple like recess whereon said body is mounted is located at the apex of said cup like electrode.
Claim 4
Dependent Claim
41 words
The invention according to claim 1 in which said radioactive body is encapsulated in a rivet head of a rivet and in which there is a hold through said electrode at said dimple like recess into which said rivet is mounted.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |