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:
Jul. 05, 1983
Filed:
Aug. 05, 1981
Koji Harada, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A pressure-sensitive ignition plug capable of sensing the internal pressure of a cylinder of an internal combustion engine and transmitting accommodated signal corresponding to the internal pressure. The pressure-sensitive ignition plug has a pressure-sensitive unit having an annular form and mounted in an annular space formed between an insulator assembly embracing a central electrode and a metallic plug body which supports the insulator assembly. The pressure sensing unit has an upwardly projected signal terminal through which an amplifier unit for amplifying the signal from the pressure sensing unit is detachably connected to the latter. The amplifier unit is embedded in a rubber sheath covering the upper half part of the ignition plug or, alternatively, formed in an annular shape and accomodated by a metallic case having a central through bore, the metallic case being adapted to make a snap fit to a hexagonal portion of the plug body from the upper side of the latter.