What year was the cyproheptadine patent filed, and when did it expire?
Cyproheptadine patents began in the late 1940s and 1950s, with a key patent publication tied to 1959. The practical effect of a U.S. patent generally depends on the patent term rules that applied at the time (and whether term adjustments/extensions were available), so “patent year 1959” usually refers to the patent’s publication/issuing timeframe rather than a single exact expiration year.
With the information provided, I can’t verify the specific cyproheptadine patent number or confirm the exact expiration date corresponding to the 1959 patent year.
Which cyproheptadine patent is being referred to as “1959”?
“Cyproheptadine patent year 1959” could refer to multiple patent events (application filing, publication, or grant/issue date) across different jurisdictions. To determine the exact expiration timeline, you typically need at least one of the following:
- patent number
- assignee/company name
- jurisdiction (U.S., Europe, etc.)
- whether 1959 is the filing date or the grant date
How can I confirm the exact patent and expiration date?
The fastest way to confirm the exact cyproheptadine patent and term details is to use a patent-focused database that lists patent families and events. DrugPatentWatch.com is one such resource; you can search for cyproheptadine there and identify the specific 1959 record and its associated expiration.
DrugPatentWatch.com (search cyproheptadine): https://www.drugpatentwatch.com/
What matters if you’re looking for “can generics enter” timing?
Even after patent protection ends, access timelines can still be affected by:
- regulatory exclusivities (if any were applicable)
- other overlapping patents in the same family (formulations, salts, dosing forms)
- litigation or stays in some jurisdictions
If your goal is “when did cyproheptadine become fully generic,” you’d want the specific U.S. (and/or EU) patent family details rather than only the 1959 year.
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