As much as I tried to stay away from this subject I couldn't resist to add my opinion.

We all should respect patents. Infringing a patents "acknowledging it" is plain rude and unethical business decision.
Cheyenne does have a patent for their cartridges and their patents should be respected. Now, patents are very tricky and some times by slightly changing a design or function you could patent a whole product of your own. Messed up?? maybe...

I think that T-Tech could have done a better job at designing a cartridge of their own with their own fitting system and gripcompete with a product of their own creation, rather than introducing a cheap version of the Hawk Cartridge, because that's what they are too me.

I think that great ideas should be protected but at the same time there it needs to be some room for others to evolve without crossing the fine line.
I'm sure Cheyenne spent way too much money to allow someone to make profit on their creation. Do I think the membrane situation is a deal breaker?? Well, not when I cannot dispose the tube I use. DO I think Cheyenne has a valid point in here?, of course I do. They took the necessary steps to make their work "theirs"