PatCite: Navigating citations by patent classifications in Lens collections
PatCite allows you to navigate resolved Non patent literature (NPL) with open persistent identifiers such as DOIs, PubMed Ids or PMCIDs, unresolved NPLs that include simple text strings, website links, or abstracts of a patent document, and stats on backward /forward patent citations.
Here is a use case of how you can use a lens collection and patent classifications to navigate different types of citations.
In 2016, we published a draft collection of Monsanto_seed Industry granted patents since 1980 (can be accessed at https://www.lens.org/lens/collection/9824).
If you are registered and logged in in the Lens, you can clone and save this collection in your work area [see below]:
1. Using the “Tools” column, and clicking on “View in PatCite” icon
2. You would process that patent collection in PatCite and navigate all its disclosed NPL citations. By clicking on the search query name, you can copy the permalink to this query in PatCite search history in your work area. There, we only store a link to the base query. If you want to persist a specific filter/view state, bookmark it.
3. Out of the 6,896 patents in that collection, 5,141 documents disclosed 10,108 resolved NPLs and 14,658 unresolved NPLs, 77,754 backward patent citations, and 104,701 forward patent citations. To see a more granular analysis of the citations per field of technology, you can filter by patent classification codes (note that by clicking on the “i” yellow circle next to a classification code, you can view its definition and the level of hierarchy you are zooming at  ). For example, filtering by the cooperative patent classification code C07k14/415 allows you to view the top cited articles in inventions related to peptides having > 20 amino acids Gastrins Somatostatins Melanotropins derivatives from plants  . From there, you can combine various codes or drill down further to a more granular technology field, if you choose to.
4. When viewing the list of NPL citations, if the cited scholarly work has been resolved by the open persistent identifiers, we display all known identifiers and the type of citation (Journal article, book, etc..) and provide links to either PubMed or the publisher’s site to enable you to browse or read about that work. We also list for each cited work, the number of citing patents or citing patent families so you can explore the granular information as well per cited work.
If the cited scholarly work has not been resolved yet, we display it as “unknown” .
Soon we hope to also add whether the citation was contributed by the applicant or by the examiner and how relevant it is to the invention, which would then also reflect the potential value of such citation.