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US Patents

A.C. and D.C. voltage polarity indicator utilizing electrochromi

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative

Patent

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How useful is this invention? - Does humanity need patent for this invention?

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Copied from somewhere

Already used for thousands of years

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Bloory idea and bloory practical use

Very broad patent, without practical use

What is the true purpose of this patent? - Does this patent serve only to stop other inventors persuing an idea, or it is patented to solve a specific problem?

Patented to preserve knowledge

Defensive patent

I am not sure

Manufacturing base and used to stop/slow down rivals

Serves only patent trolls

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