What does US5637767 cover (and how it relates to pregabalin mandelic acid)?
US 5,637,767 is a U.S. patent listed in Google Patents under the search term “pregabalin mandelic acid.” In practice, searches like this usually target patents that claim a specific pregabalin salt form made with mandelic acid (i.e., a “pregabalin mandelate”), or methods of preparing/isolating that salt.
Because I only have the patent number from your message and not the text of the record itself, I can’t reliably state the exact claim scope (for example, whether the independent claims cover the salt form itself, a crystalline form, a process, or both) without looking at the specific Google Patents entry.
Where to find the exact Google Patents record for US5637767
The fastest way is to search Google Patents directly for the patent number:
- Google Patents: https://patents.google.com/patent/US5637767
That page will show the title, assignee, abstract, and the claim language tied to “pregabalin mandelic acid” keywords.
How to tell if US5637767 is specifically about “pregabalin mandelate” vs pregabalin generally
On the Google Patents page for US5637767, check:
- The title and abstract for “mandelic acid,” “mandelate,” or an equivalent salt-name.
- The claims for a salt definition like “pregabalin mandelate” (or “a salt of pregabalin with mandelic acid”).
- The examples for preparation steps that combine pregabalin with mandelic acid and isolate the resulting salt.
If those sections don’t mention mandelic acid or mandelate explicitly, the match may be from background or later citations rather than the patent’s core claims.
Why people search this patent (typical use cases)
Searchers often look for a specific salt-form patent to determine:
- Whether a particular pregabalin mandelate composition could be covered by active or expired IP.
- Whether there are defined crystalline forms, purity ranges, or preparation conditions that change whether a later product “falls within” the claims.
If you want, I can extract the key claim language
If you paste the Google Patents abstract and/or the independent claim(s) text from US5637767, I can summarize:
- What exactly is claimed (salt identity, crystalline form, process steps, or all of the above),
- The relevant limitations that matter for freedom-to-operate or formulation work,
- And where “pregabalin mandelic acid” appears in the document (abstract/claims/examples).
Sources
No external sources were provided in your message, and I did not access Google Patents directly.