Inventor
HARA TATSUO
JP18 patents
⚠️ This page may combine multiple inventors who share the name “HARA TATSUO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SEIKO EPSON CORP
14 patentsUS6863435B2Mar 8, 2005
Spring, mainspring, hairspring, and driving mechanism and timepiece based thereon
SEIKO EPSON CORP26 citations92
US6843594B1Jan 18, 2005
Spring, power spring, hair spring, driving mechanism utilizing them, and timepiece
SEIKO EPSON CORP36 citations92
US6339306B1Jan 15, 2002
Control device for stepper motor, control method for the same, and timing device
SEIKO EPSON CORP28 citations92
US6194862B1Feb 27, 2001
Control device for stepper motor, control method for the same, and timing device
SEIKO EPSON CORP27 citations92
US5581519ADec 3, 1996
Analog indicator type electronic timepiece and charging method thereof
SEIKO EPSON CORP24 citations92
US6108279AAug 22, 2000
Stepping motor control device and method thereof and timepiece
SEIKO EPSON CORP16 citations84
US6183125B1Feb 6, 2001
Electronic watch
SEIKO EPSON CORP9 citations73
US6120177ASep 19, 2000
Electronic watch
SEIKO EPSON CORP10 citations73
US6097675AAug 1, 2000
Electronically controlled mechanical timepiece
SEIKO EPSON CORP13 citations73
US6012838AJan 11, 2000
Electronic watch
SEIKO EPSON CORP9 citations73
US6422739B1Jul 23, 2002
Mainspring device, timepiece, and method of controlling the mainspring device and the timepiece
SEIKO EPSON CORP13 citations72
US6367966B1Apr 9, 2002
Timepiece
SEIKO EPSON CORP3 citations62
US6439762B2Aug 27, 2002
Mainspring device and a winding protection structure
SEIKO EPSON CORP5 citations61
US7536779B2May 26, 2009
Method of manufacturing magnetic head
SEIKO EPSON CORP2 citations55