Most notably, production dates have been penciled or stamped on the butt end of the heel of the neck of most guitars and basses, although there were periods when this was not consistently done to , for example or simply omitted. Neck-dating can be useful in determining the approximate age of a guitar, but it is certainly not definitive because the neck date simply refers to the date that the individual component was produced, rather than the complete instrument. Given the modular nature of Fender production techniques, an individual neck may have been produced in a given year, then stored for a period of time before being paired with a body to create a complete guitar, perhaps, for example, in the following year. Therefore, while helpful in determining a range of production dates, a neck date is obviously not a precisely definitive reference. Most specifications for a given Fender instrument model change little if at all throughout the lifetime of the model.
3 Ways to Look Up Patent Numbers - wikiHow
Collectors frequently want to find out about the history of the pieces they collect. One rich source of information is found in the United State Patent Office which registers invention patents, design patents, trademark registrations, and label registrations. If your collectible has a patent number then information about its history is recorded. Most any large city library will have a complete set of these documents, the most useful to bottle collectors is the Patent Office Official Gazette.
Prior to that date, an estimated 9, patents had been issued. Some patent numbers, as displayed in the table, are 7 characters with the numeric portion padded with leading zeroes. Some numbers within a series may be unused.
Manual of Classification Classification Definitions U. This handy chart from the U. Patent and Trademark is helpful. Remember, even though patents have been issued since , numbered patents only started in Prior to that date, 9, patents had been issued.