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https://www.myclassicjewelry.com/blog/vintage-jewelry-patents/
Sep 05, 2014 · Vintage jewelry patents are a wonderful way to date vintage jewelry that was created prior to 1955. The documents provide illustrations (which are works of art in themselves), and filing and issue dates. Using the U.S. Patent and Trademark Site The U.S. Patent …
http://iantiqueonline.ning.com/xn/detail/1813674:Topic:78759
Feb 25, 2009 · There are design patents and there are utility patents. No doubt your PAT PEND mark is an indication that the utility patent for the clip mechanism on your earrings had been applied for. Utiltiy patents, once granted, are good for 17 years. …
https://www.myclassicjewelry.com/Trifari/Marks/TrifariMarks02.htm
Trifari PAT. PEND. This is one of the earliest Trifari marks you will see (there were a couple of earlier signatures, but they are quite rare). Prior to 1955 the U.S. copyright law did not extend protection to jewelry designs, so the major manufacturers, who employed talented jewelry designers, protected their investment with U.S. patents.
https://www.starcojewellers.com.au/w-jewelry/what-does-pat-pend-mean-on-jewelry.html
Nov 09, 2020 · The patent process could take several months, so companies marked their patent-pending jewelry “PAT. PEND.,” “DESIGN PAT. PEND.,” or “DES. PAT. PEND.” after submitting a patent application to let people know that it was waiting for approval.
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