William Keith Brewer has been granted 6 US patents while listed as an inventor at Cisco . The first was granted in 1999 and the most recent in November 2025. William Keith Brewer ranks #779,687 of 4,157,543 US inventors in our database (top 18.8%). Patent records list William Keith Brewer in Austin, TX, US.
Patents per Year Patents granted per year, 1999 to 2006 Bar chart with a peak of 1 patents in 1999. peak 1 1999: 1 patents 1999 2001: 1 patents 2001 2002: 1 patents 2002 2003: 1 patents 2003 2006: 1 patents 2006
Issued Patents All Time
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Showing 1–6 of 6 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
12458925 Membrane devices for filtration and extraction Matthew G. FITTS 2025-11-04
7006520 System and method of operation for managing data communication between physical layer devices and ATM layer devices William P. Hann , Matthew Irvin , Richard L. House 2006-02-28
$28,418,000
6535520 System and method of operation for managing data communication between physical layer devices and ATM layer devices William P. Hann , Matthew Irvin , Richard L. House 2003-03-18
$112,547,000
6381245 Method and apparatus for generating parity for communication between a physical layer device and an ATM layer device William P. Hann , Matthew Irvin , Richard L. House 2002-04-30
$226,330,000
6252878 Switched architecture access server Robert H. Locklear, Jr. , Craig Cantrell , Kip R. McClanahan , Anthony J. P. Carew 2001-06-26
$561,785,000
5905781 Communication server apparatus and method John Francis McHale , James R. Sisk , Robert H. Locklear, Jr. , Clifford L. Hall 1999-05-18
$836,906,000
