Assignee
DAIDO OXYGEN
JP·45 granted patents·758 citations·filing 1976–1995
Top patents by PatentIndex Score
45 records- 0185US5417776AHard austenitic stainless steel screwDAIDO OXYGEN·Filed 1994·Granted May 23, 1995·47 cites·1 claims
- 0283US4853015AHigh purity nitrogen and oxygen gas production equipmentDAIDO OXYGEN·Filed 1988·Granted Aug 1, 1989·40 cites·2 claims
- 0382US4617040AHighly pure nitrogen gas producing apparatusDAIDO OXYGEN·Filed 1984·Granted Oct 14, 1986·33 cites·12 claims
- 0480US5252131AApparatus for gas source molecular beam epitaxyDAIDO OXYGEN·Filed 1992·Granted Oct 12, 1993·34 cites·4 claims
- 0579US4975147AMethod of pretreating metallic worksDAIDO OXYGEN·Filed 1990·Granted Dec 4, 1990·44 cites·3 claims
- 0679US4668260AHigh-purity nitrogen gas production equipmentDAIDO OXYGEN·Filed 1985·Granted May 26, 1987·36 cites·6 claims
- 0775US5013371AMethod of nitriding steelDAIDO OXYGEN·Filed 1990·Granted May 7, 1991·31 cites·1 claims
- 0875US4671813AHighly pure nitrogen gas producing apparatusDAIDO OXYGEN·Filed 1984·Granted Jun 9, 1987·25 cites·13 claims
- 0975US4555526AMethod for producing hydrocarbonsDAIDO OXYGEN·Filed 1984·Granted Nov 26, 1985·12 cites·7 claims
- 1074US5376188AMethod of nitriding austenitic stainless steel productsDAIDO OXYGEN·Filed 1993·Granted Dec 27, 1994·35 cites·7 claims
- 1172US5340412AMethod of fluorinated nitriding of austenitic stainless steel screwDAIDO OXYGEN·Filed 1993·Granted Aug 23, 1994·15 cites·4 claims
- 1271US4732595AOxygen gas production apparatusDAIDO OXYGEN·Filed 1986·Granted Mar 22, 1988·26 cites·1 claims
- 1370US4131528AProcess for the mass production of ozoneDAIDO OXYGEN·Filed 1976·Granted Dec 26, 1978·16 cites·8 claims
- 1469US5141567AMethod of nitriding steelDAIDO OXYGEN·Filed 1991·Granted Aug 25, 1992·24 cites·1 claims
- 1566US4838201AApparatus and process for vacuum chemical epitaxyDAIDO OXYGEN·Filed 1986·Granted Jun 13, 1989·23 cites·11 claims
- 1665US4951603AApparatus for producing semiconductorsDAIDO OXYGEN·Filed 1988·Granted Aug 28, 1990·35 cites·2 claims
- 1765US4698079AHigh-purity nitrogen gas production equipmentDAIDO OXYGEN·Filed 1985·Granted Oct 6, 1987·21 cites·3 claims
- 1863US5460875AHard austenitic stainless steel screw and a method for manufacturing the sameDAIDO OXYGEN·Filed 1994·Granted Oct 24, 1995·11 cites·2 claims
- 1962US5176889AMethod and apparatus for treatment of NF3 gasDAIDO OXYGEN·Filed 1992·Granted Jan 5, 1993·7 cites·2 claims
- 2061US5252145AMethod of nitriding nickel alloyDAIDO OXYGEN·Filed 1992·Granted Oct 12, 1993·20 cites·5 claims
- 2160US4731102AOxygen gas production apparatusDAIDO OXYGEN·Filed 1986·Granted Mar 15, 1988·19 cites·2 claims
- 2259US5445683ANickel alloy products with their surfaces nitrided and hardenedDAIDO OXYGEN·Filed 1992·Granted Aug 29, 1995·16 cites·4 claims
- 2359US5254181AMethod of nitriding steel utilizing fluoridingDAIDO OXYGEN·Filed 1991·Granted Oct 19, 1993·19 cites·2 claims
- 2456US5419948AHard austenitic stainless steel screw and a method for manufacturing the sameDAIDO OXYGEN·Filed 1993·Granted May 30, 1995·17 cites·4 claims
- 2556US4979465AApparatus for producing semiconductorsDAIDO OXYGEN·Filed 1989·Granted Dec 25, 1990·13 cites·3 claims
- 2653US5336300AMethod and apparatus for separating mixed gasDAIDO OXYGEN·Filed 1993·Granted Aug 9, 1994·21 cites·4 claims
- 2752US5508106AMethod of vacuum insulation and a vacuum heat insulator used thereinDAIDO OXYGEN·Filed 1994·Granted Apr 16, 1996·15 cites·6 claims
- 2851US4829021AProcess for vacuum chemical epitaxyDAIDO OXYGEN·Filed 1987·Granted May 9, 1989·19 cites·9 claims
- 2946US5118642AMethod for producing semiconductorsDAIDO OXYGEN·Filed 1991·Granted Jun 2, 1992·12 cites·6 claims
- 3045US5403409ANitrided stainless steel productsDAIDO OXYGEN·Filed 1993·Granted Apr 4, 1995·10 cites·3 claims
- 3144US5399199AApparatus for gas source molecular beam epitaxyDAIDO OXYGEN·Filed 1993·Granted Mar 21, 1995·6 cites·1 claims
- 3244US5261982AMethod of manufacturing a heat insulation pipe bodyDAIDO OXYGEN·Filed 1992·Granted Nov 16, 1993·6 cites·1 claims
- 3344US5112030AHeat treat furnace for fluorinating steel materialDAIDO OXYGEN·Filed 1990·Granted May 12, 1992·10 cites·2 claims
- 3439US5505791AProcess of producing nitrided and hardened nickel alloy productsDAIDO OXYGEN·Filed 1995·Granted Apr 9, 1996·6 cites·16 claims
- 3538US4751372AVacuum chamber heater apparatusDAIDO OXYGEN·Filed 1986·Granted Jun 14, 1988·6 cites·9 claims
- 3637US5382318AHard austenitic stainless steel screw and a method for manufacturing the sameDAIDO OXYGEN·Filed 1993·Granted Jan 17, 1995·9 cites·3 claims
- 3737US5194097AMethod of nitriding steel and heat treat furnaces used thereinDAIDO OXYGEN·Filed 1992·Granted Mar 16, 1993·6 cites·1 claims
- 3833US6020025AMethod of manufacturing a crank shaftDAIDO OXYGEN·Filed 1995·Granted Feb 1, 2000·3 cites·4 claims
- 3933US5208073AMethod of manufaturing a colored metallic sheetDAIDO OXYGEN·Filed 1991·Granted May 4, 1993·2 cites·1 claims
- 4032US6179932B1Motor rotary shaft and manufacturing method thereofDAIDO OXYGEN·Filed 1994·Granted Jan 30, 2001·2 cites·2 claims
- 4132US5494740AMethod of high vacuum heat insulation and a vacuum heat insulator used thereinDAIDO OXYGEN·Filed 1994·Granted Feb 27, 1996·3 cites·7 claims
- 4231US5399211AMethod of plating steelDAIDO OXYGEN·Filed 1993·Granted Mar 21, 1995·2 cites·2 claims
- 4330US5426998ACrank shaft and method of manufacturing the sameDAIDO OXYGEN·Filed 1994·Granted Jun 27, 1995·0 cites·4 claims
- 4430US5401473AMethod and apparatus for treatment of NF3 gasDAIDO OXYGEN·Filed 1993·Granted Mar 28, 1995·1 cites·10 claims
- 4530US5207845AProcess for manufacturing rolled articles of titanium materialDAIDO OXYGEN·Filed 1991·Granted May 4, 1993·0 cites·1 claims
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