Documenting Your Collections
Info-Muse Network Documentation Guide

Les guides électroniques de la SMQ

Patent Date (Identification)

Field used for science and technology collectionsSociété des musées québécois Info-Muse database field


  • This field contains the date on which the manufacturer was granted the patent.


  1. The patent date generally follows the patent number. These two details are marked on the nameplate on the object.
  2. This field is used in conjunction with the Patent Number field.

Entry rules:

  1. Enter the patent date in the form YYYY (Y for "year").

    Patent Date1957
  2. If the month and day on which the patent was registered are known, enter the information in the form YYYY dash MM dash DD, in numbers only (Y for "Year," M for "Month" and D for "Day").

    Patent Date 1957-10-25
  3. If you are unsure whether your information is correct, include a space and a question mark after the date.
  4. If the patent date is not marked, leave the field blank.

    The nameplate on an ohmmeter shows the patent number 342415, but no patent date.

      Object Name ohmmeter
     Patent Number 342415
    Patent Date 
  5. This field may contain multiple entries separated by a semicolon followed by a space. They should be entered in the order in which they appear on the nameplate and correspond to the entries in the Patent Number field.

    The nameplate on a pressure meter shows the following patent numbers and dates: 1673524-1897 June 3rd and 1683452-1898 May 5th.

      Object Namepressure meter
     Patent Number1673524; 1683452
    Patent Date 1897-06-03; 1898-05-05 © Société des musées du Québec