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Class Information
Number: 246/28F
Name: Railway switches and signals > Block-signal systems > Automatic > Electric > Checking circuits
Description:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6043501 |
Continuous input cell for data acquisition circuits |
Mar. 28, 2000 |
| 5711497 |
Cab signaling apparatus and method |
Jan. 27, 1998 |
| 5094413 |
Device for the protection of track relays from electrical disturbances |
Mar. 10, 1992 |
| 5026009 |
Method for tracking trains through multiple false track circuit occupancies |
Jun. 25, 1991 |
| 4932615 |
Railroad track simulator for assessing track signal susceptibility to electric power line interference |
Jun. 12, 1990 |
| 4897640 |
Method and electrical circuit for the reliable detection of process states within freely couplable units |
Jan. 30, 1990 |
| 4787581 |
Train detection system operating in accordance with the axle-counting principle |
Nov. 29, 1988 |
| 4656586 |
Automatic vehicle testing apparatus |
Apr. 7, 1987 |
| 4611775 |
Railway track switch control apparatus |
Sep. 16, 1986 |
| 4494717 |
Vital transmission checking apparatus for communication channels |
Jan. 22, 1985 |
| 4467270 |
Automatic departure test unit for cab signal equipment |
Aug. 21, 1984 |
| 4456997 |
Facility for fail-safe data transmission between trackside equipment of a guideway and vehicles moving therealong |
Jun. 26, 1984 |
| 4451018 |
Non contact isolated current detector |
May. 29, 1984 |
| 4432517 |
Circuit for detecting unbalance of the traction current in a track circuit |
Feb. 21, 1984 |
| 4389033 |
Broken rail/bond detectors |
Jun. 21, 1983 |
| 4349170 |
Safety coding process for track circuits |
Sep. 14, 1982 |
| 4307463 |
Vital rate decoder |
Dec. 22, 1981 |
| 4247790 |
Failsafe train vehicle control signal threshold detector apparatus |
Jan. 27, 1981 |
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