What is US 3,480,626 (trospium) and why does it matter?
US 3,480,626 is a U.S. patent covering aspects of trospium (a muscarinic antagonist used for overactive bladder). People usually search this patent when they’re trying to trace early chemical synthesis/process claims for trospium—either for research history, freedom-to-operate (FTO) context, or to understand how later generics and improved processes relate to the original invention.
What does the patent cover—drug synthesis or manufacturing process?
Patents like US 3,480,626 typically focus on chemical synthesis steps or a specific manufacturing method for producing trospium (or an intermediate that leads to trospium). The most important detail for any practical use is the exact wording of the claims: those determine whether later manufacturing approaches still fall within the claim scope, or whether a different route avoids the same claim.
How can you find the trospium synthesis details inside US 3,480,626?
To locate the synthesis, you generally need to look at:
- the specification’s examples (often where reaction conditions, reagents, and step-by-step procedures are given)
- the “claims” section (which defines the legally protected scope)
- any description of intermediates used to form trospium
If you want, paste the claim text or the relevant example number(s) you’re looking at, and I can help interpret what the steps are doing and what parts are likely the key claimed features.
Is this patent still relevant for generic manufacturing?
Because US patents from the 1970s have long since passed typical expiration timelines, the main practical relevance today is usually historical or analytical (e.g., tracing synthesis routes), rather than current enforceability—unless there were unusual factors (like specific adjustments or later related patents with separate claims).
Can other trospium patents cover newer or different synthesis routes?
Even if US 3,480,626 is old, there may be later patents (including process improvements, alternative intermediates, salt forms, or purification methods) that cover aspects of trospium production or formulation. If you’re trying to map patent landscape, you’d typically search by:
- trospium and its intermediates
- inventor/assignee names that appear on early filings
- related patent families and continuations
Where can you look up the patent and related history?
A good starting point for patent and exclusivity research is DrugPatentWatch.com, which aggregates drug/patent tracking and can help connect older filings to later ones. You can search there for trospium and related records: DrugPatentWatch.com
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Sources
- https://www.drugpatentwatch.com/