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Coro Patents

Double click on the Coro patent image below for more detailed patent information.  When you are finished please click on your "back arrow" at the top left of your screen to return to my website.
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You can click on the images below for more detailed information.

​1930 Patents
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This is the first patent I was able to find so far for Coro (Cohn & Rosenberger).  It was actually a utility patent # 1,783,223 filed for on July 19, 1929 and granted on Dec. 2, 1930.
The designer on record was a man named Royal Marcher.

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This is the first design patent I was able to find for Coro (Cohn & Rosenberger).  It was patent # 82,685 filed for on August 20, 1930 and granted on Dec. 2, 1930. It was actually an ornamental design for a pin for holding gold tees!
​The designer on record was a man named Ernest Dauer.


1931 Patents
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This was the first separable clip I could find.  It is a utility patent by designer Gaston Candas and was filed on May 31, 1930 and granted on March 31, 1931.  I'm pretty sure it was done for Cohn & Rosenberger but the patent specifications do not list them.

​1933 Patents
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This was utility patent for another separable clip.  It was patent # 1,917,325 filed on Dec 1, 1932 and granted on July 11, 1933.  
The designer on record was a man named Oscar Placco 

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This was the first patent I could find from Coro's designer Adolf Katz.  It is also for a type of separable clip that can be worn together or detached for a different look.  ​It was utility patent # 1,937,347 filed on July 21,1933 and granted on November 28, 1933.

​1935 Patents
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This utility patent was for a more comfortable earring.  It was from designer Oscar Placco and was patent # 2,012,401 applied for on Feb 16, 1934 and granted on Aug 27, 1935.

​1936 Patents
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This utility patent that was designed by Royal Marcher for Coro actually opens to a compartment under the stone so that the wearer can place a perfume absorption material!  It is utility patent # 2,045,665 filed on April 1, 1935 and granted on June 30, 1936.

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This was utility patent for another separable clip.  It was patent # 1,917,325 filed on Dec 6, 1934 and granted on Nov 3, 1936.  
The designer on record was Oscar Placco. 

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This is the second design patent I was able to find for Coro.  It was an Adolph Katz design of a camera used for a pendant.

​1937 Patents (the first 6 are utility patents and the rest are Adolf Katz designs)

​These 3 are monogram utility patents by Ralph Bangs.  The center one is a brooch and the other 2 are buttons.
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These 3 are separable utility patents by Oscar Placco
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These 14 are design patents by Adolf Katz
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​1938 Patents
​These 2 are monogram utility patents and a jewel setting tool by Ralph Bangs
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This patent didn't have a picture but it is a patent for monogrammed handles for brushes and other 'boudoir articles'.
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This patent is actually for a jewel setting tool.
These 2 are utility patents by Oscar Placco
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This one has a separable base to be used for different jewelry ornaments such as pins, brooches, pendants and other articles of jewelry.
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This is actually a clip with a loop that a scarf or similar article can fit through.
​These 2 are design patents by Adolf Katz
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The following are later patents - I still have to put the rest of the 1930's patents on.

1943 Patents
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136,505 1943 Brooch
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136,506 1943 Brooch
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136,507 1943 Brooch
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136,832 1943 Brooch
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136,833 1943 Brooch
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136,868 1943 Brooch
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136,998 1944 Brooch
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136,999 1944 Brooch
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137,000 1944 Brooch
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137,001 1944 Brooch
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  • Welcome
  • Contact Me To Date Your Trifari Pieces
  • Store
    • Jewelry >
      • Brooch/Pins
      • Necklaces / Pendants
      • Bracelets
      • Earrings
      • Watches
      • Rings
      • Belts & Buckles
      • Bolo Ties / Tie Clips
      • Cuff Links
    • Brand >
      • Trifari
      • Coro
      • Monet
      • Napier
      • Sarah Coventry
  • Researching Patents & More
    • All Things Trifari >
      • Trifari Patents by Year and Also by Collection
      • Trifari Makers Marks & Trade Marks
      • Trifari Collections & Advertisements
    • Sold Items for Reference >
      • Trifari Sold Items for Reference >
        • Trifari Sold Brooches / Pins for Reference
        • Trifari Sold Necklaces / Pendants for Reference
        • Trifari Sold Bracelets for Reference
        • Trifari Sold Earrings for Reference
    • Makers Marks
    • Vintage Advertisements
    • Jewelry Utility Patents
    • Trifari Patents by Year and Also by Collection
    • 1926 Trifari Patents
    • 1932 Trifari Patents
    • 1936 Trifari Patents
    • 1937 Trifari Patents
    • 1938 Trifari Patents
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    • Trifari Fruit & Vegetable Patents
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    • Coro Patents
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