Inventor · disambiguated record
Duane Christensen
Also filed as: CHRISTENSEN DUANE
17 granted patents·10 pending applications·157 citations·filing 1995–2017
94Inventor score
Files withSMEAD MFG CO13CHRISTENSEN DUANE8DODSON DARRYLL3BLACK STEVEN CHARLES2THE SMEAD MFG COMPANY1
Top patents by PatentIndex Score
27 records- 0192US7850062B2Integrated tab file systemSMEAD MFG CO·Filed 2007·Granted Dec 14, 2010·11 cites·7 claims
- 0287US8550330B2Integrated tab hanging file systemBLACK STEVEN CHARLES·Filed 2011·Granted Oct 8, 2013·11 cites·10 claims
- 0387US5720427AReinforced expandable foldersSMEAD MFG CO·Filed 1996·Granted Feb 24, 1998·47 cites·31 claims
- 0486US8104669B2Strengthened folder with inserted elements and system for element interchangeabilityCHRISTENSEN DUANE·Filed 2008·Granted Jan 31, 2012·12 cites·10 claims
- 0585US9586432B2Integrated tab hanging file systemSMEAD MFG CO·Filed 2015·Granted Mar 7, 2017·3 cites·12 claims
- 0682US9296247B2Multiple pocket folders and method of manufactureSMEAD MFG CO·Filed 2014·Granted Mar 29, 2016·6 cites·11 claims
- 0779US8540138B1Stair step portfolio fileCHRISTENSEN DUANE·Filed 2010·Granted Sep 24, 2013·6 cites·15 claims
- 0878US9272565B2Integrated tab hanging file systemSMEAD MFG CO·Filed 2013·Granted Mar 1, 2016·3 cites·10 claims
- 0974US2010044418A1Layered-construction Document Storage SystemSMEAD MFG CO·Filed 2009·Application pending·0 cites
- 1072US8425387B1Method for manufacturing stair step portfolio fileCHRISTENSEN DUANE·Filed 2010·Granted Apr 23, 2013·4 cites·10 claims
- 1170US2008184604A1Layered-construction Document Storage SystemCHRISTENSEN DUANE·Filed 2008·Application pending·0 cites
- 1269US8534534B2Integrated tab file systemCHRISTENSEN DUANE·Filed 2010·Granted Sep 17, 2013·2 cites·13 claims
- 1368US2009045246A1Folder With GussetDODSON DARRYLL·Filed 2008·Application pending·0 cites
- 1466US2008030016A1Integrated tab hanging file systemBLACK STEVEN CHARLES·Filed 2007·Application pending·0 cites
- 1565US2006162197A1Layered-construction document storage systemSMEAD MFG CO·Filed 2006·Application pending·0 cites
- 1665US2014128236A1Strengthened Folder With Inserted Elements and System for Element InterchangeabilityCHRISTENSEN DUANE·Filed 2014·Application pending·0 cites
- 1763US5711750AReinforced expandable foldersSMEAD MFG CO·Filed 1995·Granted Jan 27, 1998·29 cites·4 claims
- 1861USD734390SFile folder with multiple pocketsCHRISTENSEN DUANE·Filed 2013·Granted Jul 14, 2015·10 cites·1 claims
- 1960US2012125985A1Strengthened Folder With Inserted Elements and System for Element InterchangeabilityCHRISTENSEN DUANE·Filed 2012·Application pending·0 cites
- 2058US2017225501A1Strengthened Folder With Inserted Elements and System for Element InterchangeabilitySMEAD MFG CO·Filed 2017·Application pending·0 cites
- 2152USD744587SFile folder with multiple pocketsSMEAD MFG CO·Filed 2015·Granted Dec 1, 2015·5 cites·1 claims
- 2252US8596516B2Secure folder with double binderDODSON DARRYLL·Filed 2009·Granted Dec 3, 2013·1 cites·12 claims
- 2350US9469148B1Stair step portfolio fileSMEAD MFG CO·Filed 2015·Granted Oct 18, 2016·0 cites·15 claims
- 2449US2011017810A1Folder With GussetSMEAD MFG CO·Filed 2010·Application pending·0 cites
- 2548US2011290866A1Folder With GussetDODSON DARRYLL·Filed 2011·Application pending·0 cites
- 2636USD380495SPaper handling device designTHE SMEAD MFG COMPANY·Filed 1996·Granted Jul 1, 1997·3 cites·1 claims
- 2729US5713682APaper handling deviceSMEAD MFG CO·Filed 1996·Granted Feb 3, 1998·4 cites·22 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →