US 11,866,078 B2
Rail warning system and method
Peter M Bartek, Ledgewood, NJ (US)
Assigned to HARSCO TECHNOLOGIES LLC, Fairmont, MN (US)
Filed by HARSCO TECHNOLOGIES LLC, Fairmont, MN (US)
Filed on Feb. 8, 2021, as Appl. No. 17/248,802.
Application 17/248,802 is a continuation of application No. 16/206,635, filed on Nov. 30, 2018, granted, now 10,913,472.
Application 16/206,635 is a continuation of application No. 15/211,390, filed on Jul. 15, 2016, granted, now 10,179,596, issued on Jan. 15, 2019.
Claims priority of provisional application 62/197,913, filed on Jul. 28, 2015.
Claims priority of provisional application 62/194,029, filed on Jul. 17, 2015.
Prior Publication US 2021/0323591 A1, Oct. 21, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B61L 23/00 (2006.01); B61L 23/06 (2006.01); H04B 1/69 (2011.01); G08B 5/00 (2006.01); G08B 6/00 (2006.01); G08G 1/005 (2006.01); H04B 1/3827 (2015.01); B61L 1/02 (2006.01); B61L 15/00 (2006.01); B61L 25/02 (2006.01)
CPC B61L 23/06 (2013.01) [G08B 5/006 (2013.01); G08B 6/00 (2013.01); G08G 1/005 (2013.01); H04B 1/3827 (2013.01); H04B 1/69 (2013.01); B61L 1/02 (2013.01); B61L 15/0027 (2013.01); B61L 25/026 (2013.01); H04B 2001/6912 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A portable roadway protection system comprising:
a first portable device having a first wireless transceiver
a second portable device configured to be carried by a first rail worker, the second portable device having a second wireless transceiver configured to transmit one or more second signals to the first portable device
a third portable device configured to be carried by a second rail worker, the third portable device having a third wireless transceiver configured to transmit one or more third signals with the first portable device
where:
based on the second and third signals, the first portable device is configured to determine a first distance between the second portable device and the third portable device; and
based on the distance being greater than a threshold distance, the first portable device is configured to transmit an alert signal.