Reputation: 1
Wrong results for restricted date search via Google Search API for Google Patens
I have been querying Google Patents with via Google Search API with queries like: Search URL: https://www.googleapis.com/customsearch/v1?q=%22heat%22+before:publication:20090101&start=1&filter=1&cx=<my_cx>=<my_key>&siteSearch=patents.google.com
However, the results don't have the date boundary expected, ex. publication before 2009-01-01 in the example above. Why?
I tried changing the position of key=API_KEY&cx=<Your_PSE_ID> and removing "&siteSearch=patents.google.com". Therefore, for a test search with only one exact term ex. "heat" and patent publication date before 2009-01-01 (format YYYYMMDD), the new URL is: https://www.googleapis.com/customsearch/v1?key= API_KEY&cx= My_PSE_ID&q=%22heat%22+before:publication:20090101&start=1&filter=1
where My_PSE_ID = "9543551b8b9da40ed" in my case.
However, I still get the same results that include documents with publication dates after 2009-01-01. The first 10 results that I get are:
patents.google.com/patent/EP0761639A1/fr Publication date: 1997-03-12 Document date (dc.date): 1996-06-26 patents.google.com/patent/US5019402A/en Publication date: 1991-05-28 Document date (dc.date): 1990-02-20 patents.google.com/patent/US9314369B2/en Publication date: 2016-04-19 Document date (dc.date): 2008-01-17 patents.google.com/patent/US8273114B2/un Publication date: 2012-09-25 Document date (dc.date): 2006-11-03 patents.google.com/patent/EP3337269A1/de Publication date: 2018-06-20 Document date (dc.date): 2016-08-29 patents.google.com/patent/WO2010117508A2/en Publication date: 2010-10-14 Document date (dc.date): 2010-02-24 patents.google.com/patent/EP3355645B1/de Publication date: 2024-06-26 Document date (dc.date): 2016-08-05 patents.google.com/patent/EP2429234A1/zh Publication date: 2012-03-14 Document date (dc.date): 2010-04-19 patents.google.com/patent/EP3681043A1/fr Publication date: 2020-07-15 Document date (dc.date): 2019-12-10 patents.google.com/patent/WO2013057690A1/en Publication date: 2013-04-25 Document date (dc.date): 2012-10-18
Upvotes: 0
Views: 25