Watch hairspring and method for making same

Horology: time measuring systems or devices – Oscillating or reciprocating means – Balance wheel type

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C267S166000

Reexamination Certificate

active

07077562

ABSTRACT:
The invention relates mainly to a hairspring intended to equip the balance wheel of a mechanical timepiece. It is in the form of a spiraled rod (10) cut from an {001} single-crystal silicon plate. Its structure and its dimensions are calculated so as to minimize the thermal drift of the hairspring/balance-wheel assembly by means of the first and second thermal coefficients of its spring constant.

REFERENCES:
patent: 3696687 (1972-10-01), Harland
patent: 3735586 (1973-05-01), Berney
patent: 3956881 (1976-05-01), Vuille et al.
patent: 4922756 (1990-05-01), Henrion
patent: 5152851 (1992-10-01), Yamamoto et al.
patent: 6101805 (2000-08-01), Wassenhoven
patent: 6863435 (2005-03-01), Moteki et al.
patent: 101 27 733 (2003-02-01), None
patent: WO 02 04836 (2002-01-01), None
Patent Abstracts of Japan, vol. 018, No. 408 (M-1647), Jul. 29, 1994; & JP 06 117470 A. (Yokogawa Electric Corp), Apr. 26, 1994.
Patent Abstracts of Japan, vol. 010, No. 265 (M-515), Sep. 10, 1986 & JP 61 088033 A (Kyocera Corp), May 6, 1986.
Patent Abstracts of Japan, vol. 016, No. 208 (M-1249) May 18, 1992 & JP -04 034226 (Toshiba Corp), Feb. 5, 1992.
Patent Abstracts of Japan, vol. 016, No. 501, Oct. 16, 1992 & JP 04 185698 A (Seiko Epson Corp), Jul. 2, 1992.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Watch hairspring and method for making same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Watch hairspring and method for making same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Watch hairspring and method for making same will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3589207

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.