What Happened

Patents last 20 years from filing. But if the Patent Office takes too long examining your application, you lose patent term through no fault of your own. Congress addressed this with Patent Term Adjustment (PTA), which adds days back onto your patent term to compensate for USPTO delays.

Why It Matters

PTA comes in three flavors. Type A: the Patent Office misses statutory deadlines (like issuing a first office action within 14 months). Type B: the whole examination takes more than three years from filing. Type C: delays from secrecy orders, appeals, or interference proceedings.

But there's a catch: applicant delays subtract from PTA. If you take three months to respond to an office action, that's three months of PTA you don't get. The Patent Office calculates this automatically, but they make mistakes—often in their favor.

For pharmaceutical patents especially, PTA can mean millions of dollars. Every extra day of patent term is another day without generic competition. Companies routinely challenge PTA calculations, and the Federal Circuit hears these cases regularly.

What You Should Know

If you're prosecuting patents, track PTA as you go. Respond promptly to office actions to minimize applicant delay. When the patent issues, verify the PTA calculation. If it looks wrong, file a request for reconsideration within two months.

If you're challenging patents, check the PTA calculation. Errors happen, and an inflated PTA can affect infringement and damages calculations.

PTA is a small part of patent law but can have big financial consequences.