Springfield; Christopher W.

Patent Applications and Registrations

Patent applications and USPTO patent grants for Springfield; Christopher W..The latest application filed is for "echo canceler circuit and method".

Company Profile

0.6.6

Springfield; Christopher W. - Chandler AZ US

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Echo canceler circuit and method Grant 8,811,603 - Piket , et al. August 19, 2	2014-08-19
Echo Canceler Circuit and Method App 20130184036 - Piket; James B. ; et al.	2013-07-18
Echo canceler circuit and method Grant 8,238,546 - Piket , et al. August 7, 2	2012-08-07
Echo Canceler Circuit and Method App 20100022282 - Piket; James B. ; et al.	2010-01-28
Echo canceler circuit and method Grant 7,599,483 - Piket , et al. October 6, 2	2009-10-06
Reduced complexity recursive least square lattice structure adaptive filter by means of approximating the forward error prediction squares using the backward error prediction squares App 20060288067 - Barron; David L. ; et al.	2006-12-21
Double talk activity detector and method for an echo canceler circuit Grant 7,046,794 - Piket , et al. May 16, 2	2006-05-16
Echo canceler circuit and method App 20050129224 - Piket, James B. ; et al.	2005-06-16
Double talk activity detector and method for an echo canceler circuit App 20050129225 - Piket, James B. ; et al.	2005-06-16
Full-duplex hands-free transparency circuit and method therefor Grant 6,799,062 - Piket , et al. September 28, 2	2004-09-28

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