Patent · US Active

Mechanical watch having constant spring force

US8550701B2 · kind B2 · utility

0Cited by

2References

20Claims

0Family size

Assignee

Eterna AG Uhrenfabrik · CH

Inventors

Patrick Küry · Langendorf, CH
Stephan Kussmaul · Büren an der Aare, CH

Key dates

Filing date	Oct 22, 2008
Grant date	Oct 8, 2013
Priority date	—
Expiry date	Sep 24, 2030

Classification

Technology area (CPC G)Physics
CPC primaryG04B1/12
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A mechanical watch comprises a motive spring in a first spring barrel and a mechanical and/or automatic winding device. A second spring barrel and a differential having three drive trains are provided, wherein the train connected to the winding device acts on the first and second spring barrels in the same direction.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.