Inventor
SMITH ALAN DANE
US3 patents
Patents
3 patentsUS6376832B1Apr 23, 2002
Method and apparatus for determining a position of a movable barrier
CHAMBERLAIN GROUP INC42 citations91
US6956199B2Oct 18, 2005
Method and apparatus for determining a position of a movable barrier
CHAMBERLAIN GROUP INC2 citations61
US6878927B2Apr 12, 2005
Method and apparatus for determining a position of a movable barrier
CHAMBERLAIN GROUP INC3 citations57