Andrew Ritchie has been granted 11 US patents while listed as an inventor at IBM . The first was granted in 1993 and the most recent in May 2007. Andrew Ritchie ranks #435,149 of 4,157,543 US inventors in our database (top 10.5%). Patent records list Andrew Ritchie in Chatham, NJ, US.
Patents per Year Patents granted per year, 1993 to 2007 Bar chart with a peak of 3 patents in 2001. peak 3 1993: 1 patents 1993 1998: 1 patents 1998 1999: 1 patents 1999 2000: 2 patents 2000 2001: 3 patents 2001 2004: 1 patents 2004 2005: 1 patents 2005 2007: 1 patents 2007
Issued Patents All Time
Profile Widget
Showing 1–11 of 11 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
RE39648 Crankcase lubricant for heavy duty diesel oil Edward Francis Outten 2007-05-22
6873689 Voice processing system Nicholas D. Butler , David Seager Renshaw 2005-03-29
$7,802,000
6724751 Distributed voice processing system Robert Michael Jordan 2004-04-20
$6,170,000
6282268 Voice processing system Jeremy Peter James Hughes , Brian Hulse , Robert Michael Jordan , Caroline Edith Maynard , John Brian Pickering 2001-08-28
$18,210,000
6272146 Bus connection set up and tear down Ronald John Bowater , Michael Cobbett , Robert Michael Jordan 2001-08-07
$22,988,000
6205134 Voice processing system Robert Michael Jordan 2001-03-20
$35,881,000
6163535 Distributed voice processing system Robert Michael Jordan 2000-12-19
$38,646,000
6055306 Suppression of call answer supervision in a telephone network by an intelligent peripheral Zygmunt A. Lozinski , David Prime 2000-04-25
$26,364,000
6004910 Crankcase lubricant for modern heavy duty diesel and gasoline fueled engines Ricardo Bloch , Arunas T. Lapinas , Edward Francis Outten , Malcolm Waddoups 1999-12-21
$323,252,000
5719107 Crankcase lubricant for heavy duty diesel oil Edward Francis Outten 1998-02-17
$183,431,000
5232614 Lubricating oil compositions and additives for use therein Terence Colclough 1993-08-03
$143,466,000
