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:
Nov. 30, 2004
Filed:
Jul. 31, 2002
Alain Zaugg, Le Brassus, CH;
Frederic Piguet S.A., Le Brassus, CH;
Abstract
The present invention concerns a timepiece such as, in particular, a wristwatch, including a watch movement, a running equation of time device, as well as a date mechanism, this timepiece having a pair of hour ( ) and minute ( ) hands which indicate the civil time, and an additional minute hand ( ) which indicates the true time, the daily position of the true time minute hand ( ) with respect to the civil time minute hand ( ) being determined by the position of an equation of time cam ( ) driven in rotation at the rate of one revolution per year by a date mechanism, characterized in that the true time minute hand ( ) is driven by a differential gear ( ) which has for respective power take-off a gear train ( ) driving the civil time minute hand ( ) and a transmission member which co-operates with the equation of time cam ( ) to transmit the pivoting movement of said cam ( ) to the input of the differential gear.