A more thorough explanation:

Definition: Post-issue activity refers to any actions taken during the term of a patent, such as making, using, or selling a patented invention or process, without authorization.

Examples:

• A company manufactures a product that infringes on a patented invention.
• An individual uses a patented process to create a product without permission from the patent holder.
• A competitor sells a product that is covered by a patent owned by another company.

These examples illustrate how post-issue activity can occur when someone uses or sells a patented invention or process without permission from the patent holder. This can lead to legal action being taken against the infringing party, including lawsuits and damages being awarded to the patent holder.