Richard Howk has been granted 20 US patents while listed as an inventor at Federal Signal . The first was granted in 1990 and the most recent in June 2020. Richard Howk ranks #214,803 of 4,157,543 US inventors in our database (top 5.2%). Patent records list Richard Howk in Pittsford, NY, US.
Patents per Year Patents granted per year, 1990 to 2020 Bar chart with a peak of 3 patents in 1991. peak 3 1990: 1 patents 1990 1991: 3 patents 1992: 2 patents 1992 1993: 1 patents 1996: 2 patents 1996 1999: 1 patents 2000: 2 patents 2000 2004: 1 patents 2005: 1 patents 2005 2006: 1 patents 2007: 1 patents 2007 2008: 1 patents 2009: 1 patents 2009 2016: 1 patents 2020: 1 patents 2020 Issued Patents All Time
Showing 1–20 of 20 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
10670034 Trimable impeller device and system Richard Kehn , Aaron Strand 2020-06-02
$18,859,000
9289733 Mixing apparatus with stationary shaft James Maxon 2016-03-22
$16,051,000
7473025 Mixing impeller with spiral leading edge — 2009-01-06
$16,401,000
7331704 Start-up method for draft tube mixing Michael Giralico 2008-02-19
$43,537,000
7168848 Axial-pumping impeller apparatus and method for magnetically-coupled mixer Bernd Gigas 2007-01-30
$5,231,000
6997444 Radial disc impeller apparatus and method Ronald J. Weetman , Gary Hodenius 2006-02-14
$5,020,000
6896246 Aeration apparatus and method Ronald J. Weetman , Gary Hodenius 2005-05-24
$10,937,000
6796707 Dual direction mixing impeller and method Bernd Gigas 2004-09-28
$10,818,000
6142458 Mixing system for dispersion of gas into liquid media — 2000-11-07
6109449 Mixing system for separation of materials by flotation Michael Giralico , Thomas A. Post 2000-08-29
5925293 Mixer sparging apparatus — 1999-07-20
5511881 Impeller system and method for enhanced-flow pumping of liquids Thomas A. Post , Michael Joseph Preston 1996-04-30
$11,517,000
5501523 Impeller system for mixing and enhanced-flow pumping of liquids Ronald J. Weetman , Thomas A. Post 1996-03-26
$10,310,000
5203630 Side entry fluid mixing — 1993-04-20
$2,202,000
5152934 Mixing system for gas dispersion in liquids or liquid suspensions Kenneth S. Lally 1992-10-06
$2,135,000
5118199 Side entry mixer apparatus — 1992-06-02
$5,774,000
5046245 Methods of fabricating impeller blades for mixing apparatus Ronald J. Weetman 1991-09-10
$3,195,000
5005843 Chuck mechanism for detachably connecting impeller shaft and drive unit of mixing apparatus Stephen L. Markle , William F. Hutchings , Marlin D. Schutte 1991-04-09
$1,004,000
5006283 Mixing system for dispersing a compressible fluid such as gas into liquid in a vessel Marlin D. Schutte , Craig B. Bahr , Ronald J. Weetman 1991-04-09
$1,004,000
4896971 Mixing apparatus Ronald J. Weetman 1990-01-30
$3,012,000