Defensive publication: blocking without filing

When it is the right tool

When the invention is an enabling step you need to keep using but would never enforce a patent over. When it is cheap for competitors to invent independently and expensive for you to police. When the cost of filing and renewing across a family exceeds any plausible return.

The mechanism is simple: make an enabling disclosure, publicly, with a provable date. From that point it is prior art anywhere in the world and nobody can validly patent it.

What it costs you

Your own ability to patent that subject matter - India has no general grace period, so the publication is prior art against you as much as against anyone else.

So the decision has to be deliberate and made before publication, not discovered afterwards. And it should be scoped: publishing the enabling step you want to keep free does not require publishing the improvements you intend to patent.

Make sure the disclosure is genuinely enabling and genuinely dated. A vague announcement blocks nothing.

What to actually do

• Use it for steps you must keep using but would never enforce.
• Make the disclosure enabling and provably dated.
• Understand that it removes your own ability to patent that subject matter.
• Scope it - publish the step, not the improvements.