McKenna Process Company
Plant formerly located in Joliet, Illinois - ca. 1920.
Patents on railroad rails issued to George Langford, Sr.
Note: reissued patents have the same patent classifications as the original patents.

US Patent No. 1,212,364
US Patent No. 1,212,365
US Patent No. 1,212,366
US Patent No. 1,212,964
US Patent No. 1,314,877
US Patent No. 1,562,423
(reissued as RE17,561 and
again as RE17,596,
which in turn was then
reissued as RE18,213, and
then finally as RE19,638)
US Patent No. 1,659,775
US Patent No. 1,659,776
US Patent No. 1,670,515
(reissued as RE17,743)
US Patent No. 1,712,506
(reissued as RE18,165,
the same as
1,808,466)
US Patent No. 1,724,031
US Patent No. 1,732,650
(reissued as RE18,011)

US Patent No. 1,757,774
(reissued as RE17,963)
US Patent No. 1,759,458
US Patent No. 1,799,380
(reissued as RE18,568)
US Patent No. 1,799,381
US Patent No. 1,799,382
US Patent No. 1,804,792
US Patent No. 1,807,219
US Patent No. 1,808,466
(reissued as RE18,165)
US Patent No. 1,808,467
US Patent No. 1,808,468
(reissued as RE20,874)
US Patent No. 1,814,835
US Patent No. 1,833,026
US Patent No. 1,836,032
US Patent No. 1,836,033
US Patent No. 1,842,412
US Patent No. 1,858,401
US Patent No. 1,865,194

US Patent No. 1,880,349
US Patent No. 1,883,982
US Patent No. 1,890,687
US Patent No. 1,914,439
US Patent No. 1,935,473
US Patent No. 1,935,722
US Patent No. 2,030,704
US Patent No. 2,034,043
US Patent No. 2,034,044
US Patent No. 2,034,045
US Patent No. 2,034,046
US Patent No. 2,059,529
US Patent No. 2,060,328
US Patent No. 2,060,996
US Patent No. 2,063,386
US Patent No. 2,063,387
US Patent No. 2,078,082
US Patent No. 2,090,481
US Patent No. 2,090,482
US Patent No. 2,134,449
US Patent No. 2,134,450