on the patent

its the Vbe TC that is used. 

on the lm334,
it's the IC, and an external diode for the TC equalizing (if you use the example circuit later on to 
balance the TC)



on the patent

figure 3 is the basic example.

fig 1 omits the current mirror.

figure 3 is described in the details section of the patent

figure 4 or 5 has additional balancing.




todo: build figure 20, and test to see what kind of current lowering I can get


todo: build transistor only circuit of this current source, based on schematic in LM334 data sheet.
might need multiple emitter transistor EDIT: I don't think so. they aren't common in standalone packages.
only on ic die. and some are not true multi emitter, but just two bonded leads to the same emitter.

https://en.m.wikipedia.org/wiki/Multiple-emitter_transistor


article in edn covers what bob pease has for a circuit. similar to ti data sheet with transistor, but drives
constant current for an led