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patented steel tower bracing connections

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We recently inspected a self-supporting radio tower suffering from 
extensive corrosion damage.  The diagonal braces were three to 
four inch diameter steel pipes, galvanized and painted.  The pipe 
ends appeared to be (hot or cold) formed  into cones about four 
inches long, pinched down to a diameter of 3/4 inch or so, with an ID 
of 3/8".  Tear-drop shaped tabs were welded to each side of the cone, 
for a very compact single-bolt, double-shear connection to the leg 
knife plates.

Apparently, the lower ends eventually plugged (insect debris?) ,
allowing water to accumulate, leading to severe corrosion and, in 
some cases, large holes in the braces.  Interestingly, some of 
the holes are at the top end of the braces.

I'm guessing that this end connection may be a patented design.   
Does anyone have any information about who the manufacturer/supplier 
may have been?  

Dave Evans, P.E.
TNH, Inc.