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:
Mar. 27, 1990
Filed:
Jan. 30, 1989
Applicant:
Inventor:
Gerhard Kurz, Stuttgart, DE;
Assignee:
Interlava AG, Lugano, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 23 ; 417 41 ; 417 36 ; 417 45 ;
Abstract
In connection with a protective circuit for an electrically driven liquid or water vacuum cleaner it is proposed to utilize the abrupt rise of the vacuum, which is encountered when a blocking element interrupts the connection between the receptacle for the liquid and the motor/blower area. The vacuum rise is detected by a diaphragm-type vacuum governor and used for triggering a lockable flip-flop which then interrupts the current supply of the drive motor. The locked condition can be released only by disconnecting the unit from the mains.
Kurz, Gerhard. (1990). Protective circuit for an electrically driven liquid vacuum cleaner (U.S. Patent No. 4912587). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4912587
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile