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:
Oct. 15, 2019
Filed:
Dec. 05, 2018
Applicant:
Eta SA Manufacture Horlogere Suisse, Grenchen, CH;
Inventors:
Thierry Conus, Lengnau, CH;
Kaspar Trumpy, Soleure, CH;
Assignee:
ETA SA Manufacture Horlogere Suisse, Grenchen, CH;
Primary Examiner:
Int. Cl.
CPC ...
G04B 17/34 (2006.01); G04B 17/06 (2006.01); G04D 3/00 (2006.01);
U.S. Cl.
CPC ...
G04B 17/34 (2013.01); G04B 17/066 (2013.01); G04B 17/345 (2013.01); G04D 3/0041 (2013.01); G04D 3/0069 (2013.01);
Abstract
The spiral includes turns of rectangular section, whose pitch p and/or thickness e can vary from the inside curve towards the outside curve, or whose winding can deviate from the line of a perfect spiral. The inside curve can also be extended by a self-locking washer for fixing the spiral on the balance arbour with no play. The spiral is manufactured by photolithography and galvanic growth, or by micro-machining an amorphous or crystalline material, such as a silicon wafer.