Inventor · disambiguated record
David F. Christofferson
Also filed as: CHRISTOFFERSON DAVID F
8 granted patents·2 pending applications·68 citations·filing 1991–2015
86Inventor score
Top patents by PatentIndex Score
10 records- 0190US8528890B2In-line shell processingGRAUSHAR WILLIAM T·Filed 2010·Granted Sep 10, 2013·4 cites·23 claims
- 0281US7506813B2Resonator use in the print fieldQUAD GRAPHICS INC·Filed 2005·Granted Mar 24, 2009·9 cites·8 claims
- 0375US6427999B1Signature hopper loader apparatus and methodQUAD TECH·Filed 1999·Granted Aug 6, 2002·21 cites·16 claims
- 0471US8291799B2Adjustable trimming assemblyGRAUSHAR WILLIAM T·Filed 2008·Granted Oct 23, 2012·7 cites·10 claims
- 0568US2014001694A1In-line shell processingQUAD GRAPHICS INC·Filed 2013·Application pending·0 cites
- 0666US8083455B2Cover applier systemGRAUSHAR WILLIAM T·Filed 2008·Granted Dec 27, 2011·5 cites·15 claims
- 0762US5203549ACollator with printer having inclined printing path and displaceable conveyor belts to expose printing surfaceAM INT·Filed 1991·Granted Apr 20, 1993·17 cites·38 claims
- 0858US7048111B2Hopper loader apparatus and methodQUAD TECH·Filed 2002·Granted May 23, 2006·5 cites·11 claims
- 0952US2015273714A1Adjustable trimming assemblyQUAD GRAPHICS INC·Filed 2015·Application pending·0 cites
- 1051US9056401B2Adjustable trimming assemblyGRAUSHAR WILLIAM T·Filed 2010·Granted Jun 16, 2015·0 cites·5 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →