Inventor
CHRISTENSEN DUANE
US17 patents
⚠️ This page may combine multiple inventors who share the name “CHRISTENSEN DUANE”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SMEAD MFG CO
9 patentsUS5720427AFeb 24, 1998
Reinforced expandable folders
SMEAD MFG CO47 citations94
US5711750AJan 27, 1998
Reinforced expandable folders
SMEAD MFG CO29 citations91
USD744587SDec 1, 2015
File folder with multiple pockets
SMEAD MFG CO5 citations82
US7850062B2Dec 14, 2010
Integrated tab file system
SMEAD MFG CO11 citations82
US9586432B2Mar 7, 2017
Integrated tab hanging file system
SMEAD MFG CO3 citations71
US9296247B2Mar 29, 2016
Multiple pocket folders and method of manufacture
SMEAD MFG CO6 citations71
US9272565B2Mar 1, 2016
Integrated tab hanging file system
SMEAD MFG CO3 citations71
US5713682AFeb 3, 1998
Paper handling device
SMEAD MFG CO4 citations53
US9469148B1Oct 18, 2016
Stair step portfolio file
SMEAD MFG CO0 citations44
CHRISTENSEN DUANE
5 patentsUSD734390SJul 14, 2015
File folder with multiple pockets
CHRISTENSEN DUANE10 citations82
US8104669B2Jan 31, 2012
Strengthened folder with inserted elements and system for element interchangeability
CHRISTENSEN DUANE12 citations81
US8540138B1Sep 24, 2013
Stair step portfolio file
CHRISTENSEN DUANE6 citations79
US8534534B2Sep 17, 2013
Integrated tab file system
CHRISTENSEN DUANE2 citations60
US8425387B1Apr 23, 2013
Method for manufacturing stair step portfolio file
CHRISTENSEN DUANE4 citations57