In the year 2013, 3M successfully blocked Venus Safety & Helath private lts from manufacturing a product infringing its patent on “Flat Fold Personal Respiratory Protection Device'. (ref: https://indiankanoon.org/doc/194174010/)
Venus has been in this field long enough to learn to work around the patent. Today is is one of India's largest manufacturer of masks.
They are more commonly known as surgical masks or procedure masks and are majorly used by healthcare professionals.
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