be very careful with patents,,, a friend invented a simple mechanism for raising, locking and lowering tents, shade sails and awnings used at markets (amongst other things). She spent about $80,000 on patents and someone changed something, I think the words were "materially different",,, the patent became useless as she had no protection.
She was lead along by patent lawyers and went bankrupt in the end I think after owning a very successful business for years.
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Why is it so? Professor Julius Sumner Miller, a profound influence on my life, who explained science to us on TV in the 60's.
are they just as easy to take out of the ground as well ??? what can be a real pain for some people
I'm using 6 inch batten screws and an electric drill to drive them into the ground what works for me better than using a hammer ( du to problems with my hands )