Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...
Reexamination Certificate
2004-11-01
2008-07-15
Yee, Deborah (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Producing or treating layered, bonded, welded, or...
C148S534000, C148S592000, C148S593000, C148S608000, C148S651000
Reexamination Certificate
active
07399372
ABSTRACT:
A metallic bellows, composed of precipitation hardening stainless steel, includes ridge portions and valley portions formed alternately and continuously, an average grain size of 10 to 15 μm, and compressive residual stress of not less than 500 MPa provided to at least surfaces of the ridge portions and the valleys by surface working.
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patent: 6564606 (2003-05-01), Okada et al.
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English abstract of Japanese patent 405339628, Adachi, Shuhei, Dec. 21, 1993.
English abstract of Japanese patent 08277417, Oct. 22, 1996.
English abstract of Japanese patent 411207522 , Makino, Taizo et al., Aug. 3, 1999.
NHK Spring Co. Ltd.
Oliff & Berridg,e PLC
Yee Deborah
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