John D. Crabtree has been granted 7 US patents while listed as an inventor at Pipe Liners . The first was granted in 1981 and the most recent in December 2012. John D. Crabtree ranks #680,018 of 4,157,543 US inventors in our database (top 16.4%). Patent records list John D. Crabtree in Cuyahoga Falls, OH, US.
Patents per Year Patents granted per year, 1981 to 2012 Bar chart with a peak of 1 patents in 1981. peak 1 1981: 1 patents 1981 1985: 1 patents 1985 2000: 1 patents 2000 2006: 1 patents 2006 2007: 1 patents 2007 2010: 1 patents 2010 2012: 1 patents 2012
Issued Patents All Time
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Showing 1–7 of 7 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
8339804 Programmable routing module Jerry L. Penick , Gregg M. Sichner , David S. Wehrle 2012-12-25
7800919 Programmable routing module Jerry L. Penick , Gregg M. Sichner , David S. Wehrle 2010-09-21
$8,478,000
7172369 Methods for aligning pipes and connecting the lined pipe with adjacent or lateral pipes James Tate 2007-02-06
$19,286,000
7037043 Methods for lining pipes and connecting the lined pipe with adjacent or lateral pipes James Tate 2006-05-02
6154683 Low voltage industrial control system providing intrinsically safe operation Michael Kessler , Robin Slater , Robert J. Kretschmann , Martin Junker 2000-11-28
4529653 Flexible, asbestos-free gasket material Brian A. Hargreaves , Robert A. Lancaster , Noel C. McKenzie 1985-07-16
4300075 AC Regulator system for quartz iodine lamps Ralph G. Foose 1981-11-10