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Patent number dating chart

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In point of fact, those patent dates apply only to certain aspects of the case design and indicate only when those general designs were patented.

If your Zippo lighter needs repair, please visit our repair page for instructions.For purposes of assigning a date, Bulova watches break down nicely into three basic groups: 1) pre-1926, 2) 1926 through 1949, and 3) 1950 and beyond.Those three date ranges are differentiated by the presence or absence of certain case and movement markings as well as the nature of any such markings, as explained below.Before October 1852, details of granted English patents were simply recorded (enrolled) in the Patent Rolls at the end of a long, cumbersome and costly application process. The details recorded in the Rolls usually included the name, rank and address of the patentee, the title of the invention, a formal recitation of the terms of the monopoly (patent) granted and the date of grant.From the 1730s onwards patentees were also obliged to file a specification which described their invention in technical detail.English patents granted before October 1852 were first printed and published in a numbered sequence in the mid-1850s.