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. 03, 1989
Filed:
Oct. 13, 1987
Applicant:
Inventors:
Dov Z Glucksman, Brookline, MA (US);
Constantine D Pezaris, Nahant, MA (US);
Assignee:
Environmental Fragrance Technologies, Ltd., New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61L / ;
U.S. Cl.
CPC ...
219272 ; 219276 ; 219502 ; 219518 ; 219492 ;
Abstract
An aroma generating apparatus includes a driver circuit which functions as a real time lapse counter and includes a signal indicator to designate the replacement period of useful lifetime of the aroma producing cartridge. The driver circuit continuously operates between a low frequency during the off state of the resistance heating element and a high frequency during energizing of the resistance heating element. The dual frequency permits monitoring ofthe real time operation of the apparatus without the need of providing memory devices to accommodate inoperative periods of the apparatus.