I am not usre what you mean by CaC enhancement. The potassium triborate's additive package is mainly to enhance gear lube formulatons to increase load capacity and reduce tooth wear over pure S-P additive formulaions. It often includes a CaS or Ca Succinate additive for detergnecy-dispersancy and for rust protection. These additive packages also contains some additional anti-oxidants and metal inhibitors.
potassium triborate - the most throughly covered boron additive. It may be enhanced by calcium carbonate?
For Grease formulations they could be.
Borated Sulphonates - huh? "Overbased"? Are these hydroxides?
boric acid - mentioned as an Argonne Labs effort
Not sure what you mean by "patent avoidance." The borate ester has been found to be synergistic with ZDDP and other AW and FM compounds, especially where AW additives like ZDDP are being reduced in engine oil formulations. We need to keep in perspective that neither ZDDPs, molys, borates, antimonys, titaniums, tungstens, etc are the ultimate additives in and of themselves. Much research has gone into the effects of using these additives in combination with various base oils and one must carefully formulate and test to determine the efficacy of these additives in combination. I applaud your research and interest in the borates tbut there is much more to additive technology than just one element of the periodic table.
borate esters - sounds like a patent avoidance trick as esters then to be organic based