USPTO Patent Term Adjustment Hits 318 Days, Reverting to 2015 Backlog Levels

The U.S. Patent and Trademark Office (USPTO) has reported that patent term adjustment (PTA) for newly issued utility patents has reached 318 days as of mid-April 2026, when measured using a six-week trailing average. This level represents a return to conditions that prevailed in 2015, when the agency was still managing substantial examination backlogs accumulated during the early 2010s.

Understanding Patent Term Adjustment Under 35 U.S.C. § 154(b)

Under 35 U.S.C. § 154(b), the USPTO provides specific examination timeline guarantees:

• First office action within 14 months from filing
• Applicant response periods within four months
• Final prosecution resolution within three years from filing

When the Patent Office misses these statutory deadlines, patent term is extended on a day-for-day basis. Patents receive a baseline 20-year term from the filing date, but delays in examination directly add to the total patent life. As a result, average PTA across newly issued patents serves as a critical metric for assessing agency operational efficiency and the backlog status within the patent examination pipeline.

The PTA Trend: 2015 to Present

According to analysis by patent law scholar Dennis Crouch, PTA averaged approximately 320 days in 2015. Over the following six years, the USPTO methodically reduced this figure, achieving a low of roughly 120 days by mid-2021. This improvement benefited partly from reduced filing volumes during the COVID-19 pandemic.

However, this progress has undergone a sharp reversal. PTA has nearly tripled since mid-2021, growing from approximately 120 days to the current 318 days. The trajectory climbed to 296 days by December 2025, before reaching 318 days in April 2026. Recent data shows no indication of leveling off.

Six Years of Backlog Reduction Reversed

Between 2015 and 2021, the USPTO invested substantial effort into backlog elimination. That six-year achievement has now been substantially undone. A utility patent issuing today carries approximately an additional year of term beyond the statutory 20-year baseline, entirely due to USPTO examination delays.

The sustained upward trend reflects mounting systemic pressure on the examination pipeline. While USPTO Director Maureen Squires has implemented policies such as prioritizing the oldest pending cases, overall trajectory remains unfavorable. The absence of any recent flattening in the PTA curve suggests continued structural challenges in the patent examination system.

Implications for Patent Applicants and Patent Holders

Rising PTA creates competing effects for patent stakeholders:

• Positive: Patent owners receive automatic extension of exclusive rights, potentially adding a full year of market protection and royalty collection opportunity
• Negative: Extended prosecution periods introduce uncertainty into product commercialization timelines, limiting the ability to adapt to shifting competitive markets during the examination window

For patent practitioners, the extended PTA necessitates longer-range strategic planning regarding technology lifecycles and competitive positioning.

Real-Time Tracking

The USPTO maintains a public dashboard for patent term adjustment data updated weekly, allowing stakeholders to monitor ongoing trends.

The resurgence of PTA to 2015 levels signals fundamental capacity constraints within the patent examination system. Strategic decisions regarding USPTO resource allocation and examination process management through 2030 will determine whether this trend can be stabilized or reversed.