Assignee
KEYSTONE INVEST CORP
US·12 granted patents·248 citations·filing 2000–2007
Top patents by PatentIndex Score
12 records- 0195US6473964B1Method of fabricating camshaftsKEYSTONE INVEST CORP·Filed 2000·Granted Nov 5, 2002·47 cites·68 claims
- 0294US7854995B1High density dual helical gearKEYSTONE INVEST CORP·Filed 2007·Granted Dec 21, 2010·30 cites·18 claims
- 0394US6338747B1Method for producing powder metal materialsKEYSTONE INVEST CORP·Filed 2000·Granted Jan 15, 2002·48 cites·57 claims
- 0491US7794551B1Carburization of metal articlesKEYSTONE INVEST CORP·Filed 2005·Granted Sep 14, 2010·19 cites·20 claims
- 0583US7364803B1High density dual helical gear and method for manufacture thereofKEYSTONE INVEST CORP·Filed 2005·Granted Apr 29, 2008·10 cites·6 claims
- 0679US6592809B1Method for forming powder metal gearsKEYSTONE INVEST CORP·Filed 2000·Granted Jul 15, 2003·29 cites·10 claims
- 0778US6833018B1Powder metal materials including glassKEYSTONE INVEST CORP·Filed 2002·Granted Dec 21, 2004·11 cites·76 claims
- 0878US6630101B2Method for producing powder metal gearsKEYSTONE INVEST CORP·Filed 2001·Granted Oct 7, 2003·18 cites·26 claims
- 0976US6485540B1Method for producing powder metal materialsKEYSTONE INVEST CORP·Filed 2000·Granted Nov 26, 2002·18 cites·44 claims
- 1075US7455711B1Process for manufacturing hardened powder metal partsKEYSTONE INVEST CORP·Filed 2006·Granted Nov 25, 2008·3 cites·17 claims
- 1168US7416696B2Powder metal materials and parts and methods of making the sameKEYSTONE INVEST CORP·Filed 2004·Granted Aug 26, 2008·11 cites·42 claims
- 1264US6793705B2Powder metal materials having high temperature wear and corrosion resistanceKEYSTONE INVEST CORP·Filed 2001·Granted Sep 21, 2004·4 cites·46 claims
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