Report:MARPAT on STN/Search Interface/Introduction
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It takes a staff of highly trained experts to read and interpret patent documents and to correctly apply generic structure indexing, and although it is a nonprofit organization, CAS does assess fees for the use of its heavily indexed files such as REGISTRY, CAplus and MARPAT. In addition to connect hour fees, and structure searching fees, there is also sometimes a charge to display records. Because of this, offline pre-planning is crucial to execute a successful search. In MARPAT, a free display format does exist, allowing users to view generic structure hits. A user familiarized with cost-effective searching on STN makes heavy use of these free display formats to ensure that a search strategy has been successful, before displaying the results in a full format. The figure below shows an optimized STN search strategy in graphical form.
Before conducting a MARPAT search, users will need to define their structure query using the STN Express structure drawing software, available for free from STN with a subscription to the service. Structures may also be defined via an online command language on STN, but this somewhat cumbersome method is rarely used due to the availability of the free STN Express drawing software. For more information about defining the structure query, see the Chemical Structure Drawing section.
Types of Structure Searching in MARPAT
The generic structure indexing in MARPAT can be searched via two search types (substructure or closed substructure), via four different available search scopes (SAMPLE, FULL, RANGE, or SUBSET). The definitions for these search options are presented below.
- Substructure – looks for all structure matches where the query structure allows substitution at any open valency. Open valencies are sites at which additional chemical entities (like structure fragments or even larger ring systems) could be attached.
- Closed substructure – looks for all structure matches which match the query backbone exactly (but may allow variability where defined by variable groups or g-groups, discussed in more detail below). Substitutions may be allowed selectively at certain nodes.
- Sample – Runs a search over a fixed 5% of the full file
- Full – A search over the full file
- Range – Restricts searches by several parameters, including CA volumes, file entry year (NOT document publication year), or CAS Accession number.
- Subset – Limits the size of the search file to make it easier for computationally demanding searches to run to completion (by running them over only a subset of the full database as defined by a previous search).
- ↑ This graphic available from a user-directed training module. CAS website, http://www.cas.org/support/stngen/acad/basics/page3.html. Accessed on Feburary 15, 2008.