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answered on Jan 30, 2016
US 20130320168 A1 "Mounting bracket for supporting an article" is a utility patent application, not a design patent. If you want to build a different machine (product) without infringing on it, you would have to make sure your product is not equivalent to this patent application or any... View More 
answered on Jan 28, 2016
US 3456661 "Windproof umbrella" patent had effective filing date and priority date Feb 13, 1967. Patents are granted for 20 years, and accordingly this patent has expired long ago.
Once a patent is expired, the technology it covers falls in the public domain; that is, it is not... View More
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