https://www.google.com/patents/US20050273054
reply
https://www.google.com/patents/US7177798
http://www.google.com/patents?id=y8UkAAAAEBAJ&dq=5787449
https://patents.google.com/patent/US10773602B2/en
https://www.google.com/patents/US8584031
:)
https://www.google.com/patents/US20050273054
reply