Two researchers were granted US Patent 5,401,504 in 1995 — for using turmeric to heal wounds. The problem: India had been doing exactly that for thousands of years.
India's Council of Scientific and Industrial Research (CSIR) challenged the patent at the US Patent and Trademark Office. To win, it could not simply say "everyone knows this." It had to produce documented prior art — written, dated evidence that the claimed invention already existed.
The IP move
CSIR assembled dozens of references, including ancient Sanskrit texts and a 1953 paper from the Journal of the Indian Medical Association, showing turmeric's wound-healing use was known and documented. The USPTO re-examined the patent and revoked all claims in 1997 — one of the first times a developing country successfully overturned a granted US patent on traditional knowledge grounds.
The takeaways
Prior art is a weapon — but only if it is documented and findable.
A granted patent is not a final word; it can be challenged with the right evidence.
Knowing the landscape before you build (or before someone fences it off) is cheaper than litigating after.
The lesson for your business
Before you invest in a product, a mark, or a filing, know what already exists in the space — who owns what, what is free to use, and what evidence exists. That is exactly what an IP landscaping exercise does, and it costs a fraction of one legal dispute.
