Michael A. A'Hearn — 8 Patents at Caterpillar

Michael A. A'Hearn has been granted 8 US patents while listed as an inventor at Caterpillar. The first was granted in 1998 and the most recent in October 2005. Michael A. A'Hearn ranks #600,572 of 4,157,543 US inventors in our database (top 14.4%). Patent records list Michael A. A'Hearn in Shorewood, IL, US.

Patents per Year

Issued Patents All Time

Showing 1–8 of 8 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
6955115	Hydraulic circuit having pressure equalization during regeneration	Thomas J. Hajek, Sr., Larry W. Lorimor, Daniel T. Mather, Srikrishnan T. Tolappa	2005-10-18	$83,106,000
6761027	Pressure-compensated hydraulic circuit with regeneration	Daniel J. Mather, Srikrishnan T. Tolappa	2004-07-13	$29,476,000
6357230	Hydraulic ride control system	David J. Carlson, Thomas J. Hajek, Jr., Andy Hatcher, Michael Hudson, Patrick Quinn +1 more	2002-03-19	$15,159,000
6321534	Ride control	Thomas J. Hajek, Jr., Michael Hudson, Lawrence F. Schexnayder, Srikrishnan T. Tolappa	2001-11-27	$12,362,000
6205781	Fluid control system including a work element and a valve arrangement for selectively supplying pressurized fluid thereto from two pressurized fluid sources	—	2001-03-27	$12,204,000
6173639	Fluid control system having float control	Thomas J. Hajek, Jr., Srikrishnan T. Tolappa	2001-01-16	$15,427,000
6161467	Fluid control system with regeneration	Thomas J. Hajek, Jr., Tony L. Marcott, Srikrishnan T. Tolappa	2000-12-19	$18,572,000
5826487	Pressure control for a pair of parallel hydraulic circuits	—	1998-10-27	$12,942,000