United states patent dating

(Note: In our time of nostalgia advertising- this may not be entirely applicable, but other clues will provide more identification information.) The construction of your tin may also provide clues to its age.In the 1930's/40's tins were constructed of rather thick steel sheet.As time went on, the tin manufacturer realized that all that metal wasn't always needed to protect the product. Note: Certain size tins were in use during particular time periods. In some cases this can identify its age, but be cautious.They also found out that you didn't have to apply as thick a coating of paint, ink, or whatever they used to maintain a somewhat durable finish. Copyright (and Patent dates) can be misleading, appearing on the company's products for many years.

You may need to invest in some good history books, encyclopedias, and old product sales catalogs for reference sources.

A copyright date may appear but the product may not have been actually marketed until the following year or later.

Find out more about Copyright and Patent information as you read the listing below.

Look for historical events and important people in the advertising.

Much of it was used only for a short time, usually no more than five years, after the event or person was significant.

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