K-man -- some of the knife companies are falling by the wayside. They simply don't exist any more. You're almost certainly SOL on the knives by those companies.
One company, REKAT, has no functioning website at present. It was under repairs for 6+ months, then died a quiet death. If you go to their forum, tho, you should be able to find the information of how to contact Bob Brothers, who is their Mr. Fixit.
Most knife company warranties exlude abuse of the knife. When it gets down to the nitty gritty with some of the companies, any prying of any sort will be labelled abuse, and they'll say the warranty is voided. Believe I read of one such instance where the point was stabbed into the end of a log, then twisted/torqued out.
The real ticklish one of these is dropping the knife. Let's fact it, most of us drop a knife from time to time. Now, if it should happen to be off a 20-story building, I think the knife company would be write in calling that abuse, however accidental. But, I know there are incidents where knives have been dropped the entire 3 feet to the floor, and the tip has broken off. Personally, I don't see how a legitimate knife company could call that abuse, but believe several might.
If you broke a blade on a company still functioning, did you send in the knife to them, with an explanation? I think this is the best way to proceed. It gives them the opportunity to look for signs of abuse, or that the knife has been dismantled, when that is excluded by the warranty. It also gives them the opportunity to perhaps decide that your knife shouldn't have gotten past QC and been shipped. Many people have happily reported receiving brand new knives, when all they hoped for was a repair, or an adjustment on the price of a new one. I believe that being open and up fron is the best proceedure with most of them.
If you would provide us with some specifics, somebody might be able to provide you with some very sage, and explicit information to be of help to you. From your thread, you could have dropped a knife off Hoover Dam, and the tip broke. Or, you could have tried some of Cliff Stamp's more intense testing methods. The companies are not all the same, in their approach to warranties and customer service. Give us some facts, man.