Initially, from 1617, the inventions were not described, but over the next century they were increasingly described in detail until this was almost routine.

From 1711, specifications (providing full working details of the invention) began to be enrolled in a different place after the issue of the patent. Up to October 1852 the Court of Chancery was responsible for the enrolment and issue of patents of invention, and the enrolment of specifications, safe-guarding intellectual property rights in England and Wales.

Registration was not compulsory, so many designs will not be found in our records.

A utility patent First ask yourself "what do I like? Start collecting earrings from a particular era, designer or manufacturer. There are many books and websites dedicated to the subject of vintage costume jewelry. Try our vintage costume jewelry library of jewelry articles for a good starting point.. When you are examining the stones, you should look for variances in its color as well as chips or scratches.

Look for cat pins from one designer, manufacturer or in a particular metal. When you are examining the setting, look for signs of repairs and verdigris.

Trifari Weiss Kramer Coro, Corocraft & Vendome Lisner Napier Monet Park Lane Avon Sarah Coventry Marvella JJ Art Alice Caviness Hobe' Miriam Haskell Florenza Eisenberg Hattie Carnegie Beaujewels D&E, Juliana and Juliana Style Robert Hollycraft Bogoff Krementz Schiaparelli Warner Boucher Harry Iskin Kenneth Jay Lane, KJL, Kenneth Lane Mazer Brothers & Jomaz Little Nemo Austria Accessocraft N. Gielar Joseff of Hollywood Michal Negrin Theodor Fahrner Spratling Unger Brothers Rebajes Gerard Yosca Los Castillo Cini Star-Art Coppola e Toppo Walter Lampl Los Ballesteros Lanvin Flying Colors Mizpah Virgil Cantini Ed Levin Lilly Dache Dodds Limoges langani Perli Bill Schiffer Duane Pastelli Botticelli Triad Tara Jewels by Julio Amy Lacombe Escada Irena Bryner, Irena Brynner Marlene Margot de Taxco Gale Thomas L.

Robert De Mario Pell Ciner Nettie Rosenstein Matisse and Renoir Miracle Bergere Erwin Pearl Beaucraft Carl Art Laguna Gerry's Brooks Karu Arke Whiting & Davis BSK Joan Rivers Musi Givenchy Les Bernard Schreiner Judy Lee Sandor Barclay Cadoro Christian Dior Mylu Mimi di N Regency Jewelarama Danecraft Pauline Rader Sherman Schrager Carolee Eugene Beatrix 1928 Stanley Hagler, Mark Mercy & Ian St.