In reference to the patent: US 4,734,658 A

We are from India, we wish to use this patent in one of our products. Can we use this patent free of charge or we have to pay some amount?

closed as off-topic by Robert Cartaino Sep 28 '15 at 2:19

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Not a Direct Link to the Patent Holder — This is a community-run website to ask about the patent process or to help find Prior Art on US Patents or Applications. Unfortunately, we do not have a direct channel to the patent holder so they will not get your message here. For contact information see How can I contact the owner of a patent?" – Robert Cartaino
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  • Patent already expired if no overlapping patents are on said product public is open to use it. – Pushpak Sep 28 '15 at 11:18