| Patents for Thomas Elevator Co. |
Patents 1 -
15
of 15
      |
| Number | Date | Patentee | Title | Type |
| 736,572 | Aug. 18, 1903 | W.A. Barker | Electric hoist | hoists, winches, come-alongs |
| 787,609 | Apr. 18, 1905 | W.A. Barker | Hoisting-machine | hoists, winches, come-alongs |
| 983,668 | Feb. 07, 1911 | W.A. Barker | Friction-brake mechanism | |
| 1,022,349 | Apr. 02, 1912 | W.A. Barker | Multiple hoist | hoists, winches, come-alongs |
| 1,033,776 | Jul. 30, 1912 | W.A. Barker | Mechanical movement | hoists, winches, come-alongs |
| CA-145,032 | Dec. 31, 1912 | W.A. Barker | Mechanical movement | hoists, winches, come-alongs |
| 1,054,666 | Mar. 04, 1913 | W.A. Barker | Clutch mechanism | |
| 1,141,679 | Jun. 01, 1915 | W.A. Barker | Electrically-driven hoist | hoists, winches, come-alongs |
| 1,155,784 | Oct. 05, 1915 | W.A. Barker | Hoisting-machine | hoists, winches, come-alongs |
| 1,178,702 | Apr. 11, 1916 | W.A. Barker | Mechanical movement | |
| 1,249,300 | Dec. 11, 1917 | W.A. Barker | Chuck | metal lathe chucks |
| CA-189,240 | Mar. 25, 1919 | W.A. Barker | Chuck for lathes | metal lathe chucks |
| 1,373,789 | Apr. 05, 1921 | W.A. Barker | Revolving-jaw chuck | metal lathe chucks |
| 1,389,731 | Sep. 06, 1921 | W.A. Barker | Chuck | metal lathe chucks |
| 1,509,510 | Sep. 23, 1924 | E.J. Hanna | Chuck | metal lathe chucks |
