The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 1976
Filed:
May. 03, 1973
Applicant:
Inventors:
Koju Sasaki, Tokyo, JA;
Akihiro Kobayashi, Fujisawa, JA;
Assignee:
Nittan Company, Ltd., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01j / ;
U.S. Cl.
CPC ...
313 54 ; 250381 ; 3402 / ;
Abstract
An ionization smoke detector having two ionization chambers with one of said chambers having an electrode at least partially surrounded by a conductive mesh constituting an intermediate electrode and the other of said chambers being formed between the intermediate electrode and an outer surrounding electrode of conductive mesh and a radioactive source carried by said outer electrode. The volume defined by the outer and intermediate electrodes is greater than the volume defined by the intermediate electrode.