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# c12) United States Patent Cobianu et al. 

# (54) LEAD-FREE ELECTROCHEMICAL GALVANIC OXYGEN SENSOR 

(75) Inventors: Cornel Cobianu, Bucharest (RO); Bogdan-Catalin Serban, Bucharest (RO); Bryan Stewart Hobbs, West Sussex (GB) 

(73) Assignee: Life Safety Distribution AG, Hegnau (CH) 

( *) Notice: Subject to any disclaimer, the term ofthis patent is extended or adjusted under 35 U.S.C. 154(b) by 350 days. 

(21) Appl. No.: 14/241,271 

(22) PCT Filed: Sep. 14, 2011 

(86) PCT No.: PCT /RO2011/000022 § 371 (c)(l), (2), ( 4) Date: Feb. 26, 2014 

(87) PCT Pub. No.: WO2013/039414 PCT Pub. Date: Mar. 21, 2013 

## (65) Prior Publication Data 

US 2014/0231253 Al Aug. 21, 2014 

(51) Int. Cl. 

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(52) U.S. Cl. CPC .......... GOIN 271413 (2013.01); GOIN 271404 (2013.01) 

( 58) Field of Classification Search CPC ..................................... GOIN 27/404-27/4045 USPC .......................................... 204/431-432, 415 See application file for complete search history. 

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# (IO) Patent No.: US 9,557,289 B2 

# (45) Date of Patent: Jan.31,2017 

## (56) References Cited 

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China Office Action and Search Report, dated Jan. 15, 2016, corresponding to China Patent Application No. 201180074816, 9 pages. 

Primary Examiner - Bach Dinh 

(74) Attorney, Agent, or Firm - Conley Rose, P.C.; Kristin Jordan Harkins 

## (57) ABSTRACT 

A lead-free, self-corrosion-free electrochemical galvanic oxygen sensor is provided. The preferred sensor includes a container, the container including a lead-free anode, an alkali electrolyte, a carbon platinized with platinum cathode and a nickel wire current collector, wherein the container further includes a diffusion barrier that causes the sensor to operate in the limiting current region. 

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US009557289B2 

## U.S. PATENT DOCUMENTS 

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## FOREIGN PATENT DOCUMENTS 

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## OTHER PUBLICATIONS 

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## 9 Claims, 7 Drawing Sheets 

