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Copyright Statement |
SilverPlatter Guides PR Patent Priority
us in pr 93us in pr 31.10.1999 in pr 31.03.89 in pr 332502 in pr u01644 in pr
The PR field contains the priority countries, priority dates, priority serials, and filing numbers for the patent. Any dates cited contain a four-digit year (DDMMYYYY) in records added to the database from September, 1999 forward, and a two-digit year (DDMMYY) in records added prior to that date. You can search for any of these items in the formats shown above.
Note: For comprehensive retrieval of priority dates cited in 1999, include both the two-digit and four-digit formats in your search.
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