PubMed; COVID19 testing method patented by Richard ROTHSCHILD in 2015. (Scroll to 2nd result) Archive!
(pubchem.ncbi.nlm.nih.gov)
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I am sorry, but I think a priority date is something else than filing date. The priority date refers to a previous filing in a series of patents that are related. I know this, because I hold a few (worthless) patents myself.
The priority date references a patent filed under US201562240783P. ( https://patents.google.com/patent/US20200279585A1 )