Title:
Automatic door operator
United States Patent 2758835
Inventors:
Wikkerink, Lance A.
Application Number:
US30187152A
Publication Date:
08/14/1956
Filing Date:
07/31/1952
Assignee:
TREADWAY CORP
Primary Class:
Other Classes:
49/137, 49/138, 49/273, 74/516, 91/47, 91/444, 92/162R
International Classes:
E05F15/04
View Patent Images:
US Patent References:
2550349Pneumatic door operating device1951-04-24
2536489Actuator for door opening mechanisms1951-01-02
2386216Loading, hauling, and unloading equipment1945-10-09
2385151Automatic blow-off valve apparatus1945-09-18
2283577Apparatus for operating doors1942-05-19
2011652Multiple unit treadle door control apparatus1935-08-20
2009081Multiple unit treadle controlled door system1935-07-23
1859364Door operator1932-05-24
1578678Pneumatic door-operating mechanism1926-03-30
1486278Door-oferating device1924-03-11
1397987Actuating means for throttle-valves of carbureters1921-11-22
1292430N/A1919-01-28
1200826N/A1916-10-10
1054417N/A1913-02-25
0400565N/A1889-04-02
0182184N/A1876-09-12