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:
Apr. 10, 2001
Filed:
Nov. 03, 1998
Applicant:
Inventor:
Martin D. Pierson, Howell, MI (US);
Assignee:
Lionel Trains, Inc., Chesterfield, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 3/18 ;
U.S. Cl.
CPC ...
H02M 3/18 ;
Abstract
A selective voltage multiplier for a toy model train with an audio system that is activated by an input voltage, the selective voltage multiplier including either a voltage doubler or tripler multiplier circuit; a DC voltage source and a voltage divider circuit together establishing a reference voltage; an operational amplifier comparator for comparing the input voltage with the reference voltage, the comparator producing an output signal depending on whether the reference voltage exceeds the input voltage; an opto-isolator for selectively enabling the voltage multiplier circuit depending on the output signal of the comparator; and a speaker system.