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US and UK Patent and Registered Design numbers   United States and Great Britain Patent Numbers and Registered Design Numbers If you would like to date a compact and you have a patent or registered design number stamped in it you can estimate the date by using the tables below.  Remember that the year in the table is the date that the patent or design was registered, not necessarily the date of manufacture.  Patent dates for example are valid for up to 25 years. United State Patent Date Table United States Registered Design Date Table Great Britain Patent Date Table Great Britain Registered Design Date Table United State Patent Number Date Table   United States Registered Design Number Date Table   Great Britain Patent Number Date Table   Great Britain Registered Design Number Date Table     Return to Top