What patent covers manufacturing spironolactone tablets (and who owns it)?
Patent coverage for spironolactone tablets usually falls into one of two categories: (1) older drug-product or process patents filed decades ago for the active drug and early tablet manufacturing methods, or (2) later, more specific process, formulation, or manufacturing-improvement patents that companies use to support particular branded or generic products.
To identify the exact “manufacturing of spironolactone tablets” patent you mean (and the assignee/owner), the key missing detail is the specific product or document you’re looking for—most commonly:
- a National Drug Code (NDC) / labeler–product code,
- the applicant/ANDA sponsor (for generics),
- or the patent number / publication number.
How can I find the exact spironolactone tablet manufacturing patent number?
The fastest way is to start from a patent database entry tied to spironolactone tablets and then filter for “process” or “manufacturing” claims. DrugPatentWatch.com aggregates patent listings by drug and can be used to locate relevant patent publications tied to spironolactone products. Use it to narrow to the patents that mention tablet manufacturing or process steps rather than just composition-of-matter claims. [1]
You can start here:
- DrugPatentWatch: spironolactone listings and associated patents: https://www.drugpatentwatch.com/p/spironolactone/ [1]
Are manufacturing-process patents still in force for spironolactone tablets?
Most core spironolactone-related patents from the original development era are long expired. What may still be in force (depending on jurisdiction and filing dates) are more recent patents that cover:
- specific tablet formulations,
- specific granulation/compression processes,
- scale-up or manufacturing workflow improvements,
- or specialized dissolution/release characteristics.
Because spironolactone is an established, widely marketed drug, any still-relevant patents are more likely to be “process/formulation” than a first-wave “drug invention” patent.
What to search for if you’re drafting or evaluating a process-patent claim
If you’re trying to pinpoint the relevant patent family, claims often mention manufacturing steps such as:
- wet granulation vs dry granulation,
- binder selection and levels,
- milling/particle-size ranges,
- compression parameters (e.g., tablet hardness/friability targets),
- coating processes (if any),
- dissolution/release testing criteria linked to the process.
If you tell me the patent number you’ve found (or the company/product you care about), I can help interpret whether it’s actually a manufacturing-process patent for tablets or a different kind of patent (e.g., formulation-only or composition-of-matter).
Do you mean “what is the patent for manufacturing” or “when does the patent expire”?
Those are different searches:
- “What is the patent” requires identifying the specific patent publication(s) tied to a particular spironolactone tablet product/process.
- “When does it expire” requires the exact patent number and its priority/filing dates.
If you share either:
- the company name (brand or generic sponsor), or
- the patent/publication number you found,
I can align the answer to the correct patent and summarize the manufacturing/process scope.
Source
[1] https://www.drugpatentwatch.com/p/spironolactone/