13.1 Patent Term Calculation & Patent Term Adjustment (PTA)

13.1 Patent Term Calculation & Patent Term Adjustment (PTA)

Exam Tip: PTA questions on the Patent Bar frequently test the distinction between provisional filing dates (which do NOT start the 20-year clock) and nonprovisional benefit claims (which DO start the clock), as well as the 3-month applicant response window under 37 C.F.R. § 1.704.

1. Patent Term Calculation Rules (35 U.S.C. § 154)

Under 35 U.S.C. § 154(a)(2), a utility patent grants exclusive rights for a term beginning on the date the patent issues and ending 20 years from the date on which the application for the patent was filed in the United States. If the application contains a specific reference to an earlier filed application or applications under 35 U.S.C. § 120, § 121, § 365(c), or § 386(c) (such as a continuation, divisional, or continuation-in-part application), the 20-year patent term is measured from the filing date of the earliest such nonprovisional application.

Priority Claims and Their Effect on the 20-Year Clock

Not all priority claims affect the 20-year calculation in the same manner. Candidates must memorize the statutory distinction between benefit claims that start the term clock and priority claims that preserve filing dates without shortening the term:

Patent Type Term Variations

• Utility Patents: 20 years from earliest nonprovisional filing date (subject to PTA and terminal disclaimers).
• Design Patents (35 U.S.C. § 173): 15 years from the grant date for applications filed on or after May 13, 2015 (14 years from grant date for applications filed before May 13, 2015). Design patent terms are measured from grant date, not filing date, and are NOT subject to maintenance fees or PTA.
• Plant Patents (35 U.S.C. § 161): 20 years from earliest nonprovisional filing date (same calculation as utility patents).

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2. Patent Term Adjustment (PTA) Framework (35 U.S.C. § 154(b))

The American Inventors Protection Act (AIPA) of 1999 established Patent Term Adjustment (PTA) under 35 U.S.C. § 154(b) for utility and plant applications filed on or after May 29, 2000. PTA extends the 20-year term day-for-day to compensate applicants for administrative delays caused by the USPTO during examination.

The Three Categories of USPTO Administrative Delay

USPTO delay accrues under three distinct statutory provisions:

1. "A-Delay" — USPTO Response Promptness Guarantees (35 U.S.C. § 154(b)(1)(A))

The USPTO must meet four specific promptness guarantees. If the USPTO fails to take action within these statutory windows, 1 day of PTA is added for every day of delay:

• 14-Month Rule: Failure to issue a first Office Action, Restriction Requirement, or Notice of Allowability within 14 months from the nonprovisional application filing date (or national stage entry date under § 371).
• 4-Month Response Rule: Failure to respond to an applicant's reply to an Office Action or appeal brief within 4 months.
• 4-Month Board/Court Rule: Failure to act within 4 months after a decision by the Patent Trial and Appeal Board (PTAB) or a federal court where allowable claims remain.
• 4-Month Issue Rule: Failure to issue the patent within 4 months after the issue fee is paid and all formal requirements are met.

2. "B-Delay" — Application Pendency Exceeding 3 Years (35 U.S.C. § 154(b)(1)(B))

If an application is pending for more than 3 years (36 months) from its actual U.S. nonprovisional filing date (or national stage entry date), the applicant receives 1 day of PTA for each day beyond the 3-year mark until the patent issues. Exclusions from B-Delay: The 3-year pendency clock excludes time consumed by:

• A Request for Continued Examination (RCE) filed by the applicant under 37 C.F.R. § 1.114 (unless the RCE was filed after a Notice of Allowability).
• Secrecy orders, interference or derivation proceedings, or appellate review before the PTAB or courts.

3. "C-Delay" — Delays for Secrecy Orders, Interferences, and Appeals (35 U.S.C. § 154(b)(1)(C))

Day-for-day PTA is added for delays resulting from:

• Secrecy orders imposed under 35 U.S.C. § 181.
• Interference or derivation proceedings under 35 U.S.C. § 135.
• Successful appellate review before the PTAB or federal courts (reversing an adverse patentability rejection).

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3. Applicant-Caused Delays and Reductions (37 C.F.R. § 1.704)

Gross PTA (A + B + C delays) is reduced day-for-day by any periods during which the applicant failed to engage in reasonable efforts to conclude prosecution under 37 C.F.R. § 1.704.

Key Actions Constituting Applicant Delay

• Exceeding 3 Months to Respond to USPTO Actions: If an applicant takes more than 3 months to respond to any Office Action, Notice, or Requirement, every day beyond 3 months reduces PTA day-for-day.

  Crucial Exam Rule: Purchasing an extension of time under 37 C.F.R. § 1.136(a) allows the USPTO to accept the response up to 6 months, but it does NOT prevent the reduction of PTA for days exceeding the initial 3-month window!

• Supplemental Responses: Filing a supplemental response or amendment after an initial response has been filed (unless explicitly requested by the examiner) adds applicant delay for the period between the initial response and the supplemental filing.
• Disruptive preliminary papers: A preliminary amendment filed less than one month before an Office action or allowance that forces a supplemental action can cause applicant-delay reduction under Rule 1.704(c)(6); the rule uses the eight-month date in calculating the reduction for specified applications.
• Late Payment of Issue Fee: Taking more than 3 months to pay the issue fee after the Notice of Allowance.
• Submission of an IDS: Submitting an Information Disclosure Statement after an Office Action or Notice of Allowance without the required 30-day quick path / certification under 37 C.F.R. § 1.704(d).

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4. Overlap Rules and Net Calculation Formula

Under 35 U.S.C. § 154(b)(2)(A), to the extent that periods of USPTO delay overlap in calendar time, the period of adjustment is not double-counted.

$\text{Net PTA} = (\text{A-Delay} + \text{B-Delay} + \text{C-Delay} - \text{Overlap}) - \text{Applicant Delays}$

Overlap Scenario Example

Suppose an application experiences 100 days of A-delay due to a late Office Action response by the USPTO. The application also remains pending past 3 years, and during 40 of those 100 days, the application was already past its 3-year anniversary (B-delay). The overlapping period of 40 days cannot be awarded twice. Thus, gross USPTO delay is $(100 + 40) - 40 = 100$ days. If the applicant took 20 days past 3 months to respond to an action, the net PTA awarded is $100 - 20 = 80$ days.

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5. Procedure for Requesting PTA Redetermination (37 C.F.R. § 1.705)

1. Initial Determination: The USPTO calculates PTA and lists the initial determination on the Notice of Allowance and on the front face of the issued patent.
2. USPTO Request for Redetermination: If the applicant disagrees with the USPTO's calculation, the applicant must file a Request for Redetermination of Patent Term Adjustment under 37 C.F.R. § 1.705(b) within 2 months from the date the patent was granted, with extensions available for up to five additional months. The request must be accompanied by the required fee and a statement of facts specifying the USPTO delays and applicant delays.
3. Judicial Review (35 U.S.C. § 154(b)(4)(A)): An applicant dissatisfied with the Director's final decision on PTA redetermination may file a civil action against the USPTO Director in the U.S. District Court for the Eastern District of Virginia (EDVA) within 180 days after the Director’s decision on the reconsideration request.