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Flags are useful when you want to find all documents which contain a particular field. For example, you can use the has_cpcl flag to retrieve documents that have CPC classification, or the has_pcit flag to find documents which contain patent citations. Any indexed field can be used in a flag search, with the exception of fam since a default value of -1 is assigned to all records which do not contain a DocDB-assigned family-id.
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To return all documents that have a DocDB-assigned
Note that this search does not indicate the number of family members. It simply returns records which have a |
Language-Specific Searches
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The above search returns 3179559 hits while the same search without the flag returns 3192682 hits.
Similarly, flags can be used to exclude documents which have been withdrawn or deleted. In order to maintain document histories, CLAIMS Direct™ retains withdrawn and deleted records in our database. However, you may want to exclude these documents from your search. Adding the has_an flag will retrieve documents which have an application number, thus excluding withdrawn and deleted records.
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Note: It is recommended to use the asterisk wild card "*" when searching the |
fam:[ 1 TO *]