From 1790 to 1880 in the US, patent models were required.

In some jurisdictions patent models stayed an aid to demonstrate the operation of the invention.

In some jurisdictions, patent models may also be submitted to demonstrate the operation of the invention.

The fire destroyed all the patents and patent models issued from 1790.

In the US, patent models were required from 1790 to 1880.

There is nothing, such as a patent model, to indicate his role in the invention process.

The process of documenting the patent models and selling them was moving so slowly it began to haunt him.

All 10,000 patents and several thousand related patent models were destroyed.

He is by no means the first person to have this ambition, but the nation's patent models have not exactly lived a charmed life.

Page's patent model for this coil is presently on display at the National Museum of American History.