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 Title: |
US5563578:
Detection of hazardous gas leakage
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Isenstein, Robert J.; Lexington, MA 02178
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| Assignee: |
None
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| Published / Filed: |
1996-10-08
/ 1993-07-26
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| Application Number: |
US1993000096310
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| IPC Code: |
Advanced:
G08B 17/117;
G08B 21/14;
Core:
G08B 17/10;
G08B 21/00;
IPC-7:
G08B 17/00;
G08B 17/10;
G08B 19/00;
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| ECLA Code: |
G08B17/117; G08B21/14;
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| U.S. Class: |
Current:
340/521;
340/584;
340/629;
340/633;
340/634;
Original:
340/521;
340/584;
340/629;
340/633;
340/634;
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| Field of Search: |
340/517,521,522,577,578,584,600,628,629,632,633,634,691,692
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| Priority Number: |
| 1993-07-26 |
US1993000096310 |
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| Abstract: |
Method and apparatus for the detecting hazardous conditions including the hazardous leakage of carbon dioxide gases by detecting spontaneously a plurality of the conditions which are encoded with a different response for each condition; for the detection of hazardous conditions associated with combustion or potential combustion, the detection is of a plurality of gaseous conditions having different chemical and thermal characteristics and the presence of each such condition is indicated; when the detection is of the leakage of fuel gases, a plurality of catalytic units is used, each having a platinum wire extending to a junction with a comparator and bridged by a detector provided with bridge balance and threshold adjustment; periodic heat cleansing is by a multi-terminal bistable oscillator; smoky carbon particles are detected by an ionization chamber connected to alarm circuitry.
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| Attorney, Agent or Firm: |
Kersey, Esq., George E. ;
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| Primary / Asst. Examiners: |
Metjahic, Safet; Miller, John W.
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| Maintenance Status: |
E2 Expired Check current status
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| INPADOC Legal Status: |
Show legal status actions
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| Family: |
None
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First Claim:
Show all 20 claims |
What is claimed:
1. Apparatus for detecting a hazardous leakage of carbon oxide gases, which comprises
- a semiconductor sensor interconnecting driver and sink transistors;
- said sink transistor extending to a heat cleaning unit;
- said driver transistor being connected to a comparator and a bias voltage source; and
- said semiconductor sensor having an internal voltage divider and being joined to said bias source and said comparator.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
Show description
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| Forward References: |
Show 7 U.S. patent(s) that reference this one
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