Inventor
COPLEY DAVID C
US8 patents
⚠️ This page may combine multiple inventors who share the name “COPLEY DAVID C”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
CATERPILLAR INC
5 patentsUS7933420B2Apr 26, 2011
Methods and systems for determining the effectiveness of active noise cancellation
CATERPILLAR INC31 citations90
US6273213B1Aug 14, 2001
Noise suppression louver having horizontal and vertical slats
CATERPILLAR INC20 citations86
US6041657AMar 28, 2000
Outdoor noise testing system
CATERPILLAR INC27 citations85
US7635048B2Dec 22, 2009
Sound suppression device for internal combustion engine system
CATERPILLAR INC9 citations78
US7268671B2Sep 11, 2007
Shaped modulation audible alarm
CATERPILLAR INC1 citations49