Assignee
YAMASHINA SEIKOSHO KK
JP6 patents
Top patents by PatentIndex Score
US4842467AJun 27, 1989
Concrete screw
YAMASHINA SEIKOSHO KK92 citations96
US4450616AMay 29, 1984
Method of ensuring the tightness of a bolt and a nut
YAMASHINA SEIKOSHO KK62 citations94
US4329099AMay 11, 1982
Self-drilling and self-extruding fastener
YAMASHINA SEIKOSHO KK82 citations93
US4241638ADec 30, 1980
Self-extruding fastener
YAMASHINA SEIKOSHO KK97 citations93
US4136597AJan 30, 1979
Drill screw and die for producing same
YAMASHINA SEIKOSHO KK10 citations68
US4599024AJul 8, 1986
Entering end portion of drill screw
YAMASHINA SEIKOSHO KK8 citations64