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US Patents Approaching the 3.5-Year Maintenance Fee Window

494 US patents approaching their 3.5-Year maintenance fee window right now. Fee payments are due between 2026-09-06 and 2026-09-06. Patents in the 3.5yr window are 3-5 years into their term — a missed payment lapses the patent permanently. Browse free or subscribe for daily Pro alerts at $99/mo.

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7.5-Year Fee Window
Patent # Title / Assignee Fee Due Days Left
USD945111 3.5yr
2026-09-067 days
USD945112 3.5yr
2026-09-067 days
USD945113 3.5yr
2026-09-067 days
USD945114 3.5yr
2026-09-067 days
USD945115 3.5yr
2026-09-067 days
USD945116 3.5yr
2026-09-067 days
USD945117 3.5yr
2026-09-067 days
USD945118 3.5yr
2026-09-067 days
USD945119 3.5yr
2026-09-067 days
USD945120 3.5yr
2026-09-067 days
USD945121 3.5yr
2026-09-067 days
USD945122 3.5yr
2026-09-067 days
USD945123 3.5yr
2026-09-067 days
USD945124 3.5yr
2026-09-067 days
USD945125 3.5yr
2026-09-067 days
USD945126 3.5yr
2026-09-067 days
USD945127 3.5yr
2026-09-067 days
USD945128 3.5yr
2026-09-067 days
USD945129 3.5yr
2026-09-067 days
USD945130 3.5yr
2026-09-067 days
USD945131 3.5yr
2026-09-067 days
USD945132 3.5yr
2026-09-067 days
USD945133 3.5yr
2026-09-067 days
USD945134 3.5yr
2026-09-067 days
USD945135 3.5yr
2026-09-067 days
USD945136 3.5yr
2026-09-067 days
USD945137 3.5yr
2026-09-067 days
USD945138 3.5yr
2026-09-067 days
USD945139 3.5yr
2026-09-067 days
USD945140 3.5yr
2026-09-067 days
USD945141 3.5yr
2026-09-067 days
USD945142 3.5yr
2026-09-067 days
USD945143 3.5yr
2026-09-067 days
USD945144 3.5yr
2026-09-067 days
USD945145 3.5yr
2026-09-067 days
USD945146 3.5yr
2026-09-067 days
USD945147 3.5yr
2026-09-067 days
USD945148 3.5yr
2026-09-067 days
USD945149 3.5yr
2026-09-067 days
USD945150 3.5yr
2026-09-067 days
USD945151 3.5yr
2026-09-067 days
USD945152 3.5yr
2026-09-067 days
USD945153 3.5yr
2026-09-067 days
USD945154 3.5yr
2026-09-067 days
USD945155 3.5yr
2026-09-067 days
USD945156 3.5yr
2026-09-067 days
USD945157 3.5yr
2026-09-067 days
USD945158 3.5yr
2026-09-067 days
USD945159 3.5yr
2026-09-067 days
USD945160 3.5yr
2026-09-067 days
USD945161 3.5yr
2026-09-067 days
USD945162 3.5yr
2026-09-067 days
USD945163 3.5yr
2026-09-067 days
USD945164 3.5yr
2026-09-067 days
USD945165 3.5yr
2026-09-067 days
USD945166 3.5yr
2026-09-067 days
USD945167 3.5yr
2026-09-067 days
USD945169 3.5yr
2026-09-067 days
USD945170 3.5yr
2026-09-067 days
USD945171 3.5yr
2026-09-067 days
USD945172 3.5yr
2026-09-067 days
USD945173 3.5yr
2026-09-067 days
USD945174 3.5yr
2026-09-067 days
USD945175 3.5yr
2026-09-067 days
USD945176 3.5yr
2026-09-067 days
USD945177 3.5yr
2026-09-067 days
USD945178 3.5yr
2026-09-067 days
USD945179 3.5yr
2026-09-067 days
USD945180 3.5yr
2026-09-067 days
USD945181 3.5yr
2026-09-067 days
USD945182 3.5yr
2026-09-067 days
USD945183 3.5yr
2026-09-067 days
USD945184 3.5yr
2026-09-067 days
USD945185 3.5yr
2026-09-067 days
USD945186 3.5yr
2026-09-067 days
USD945187 3.5yr
2026-09-067 days
USD945188 3.5yr
2026-09-067 days
USD945189 3.5yr
2026-09-067 days
USD945190 3.5yr
2026-09-067 days
USD945191 3.5yr
2026-09-067 days

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FAQ

How many 3.5-year maintenance fee patents are approaching a maintenance fee deadline?
There are 494 3.5-year maintenance fee patents in our current dataset with maintenance fees due soon. Earliest fee window closes 2026-09-06. Data sourced from the USPTO PTMNFEE2 bulk dataset, updated weekly.
What happens if a maintenance fee is not paid?
The patent lapses and the technology enters the public domain — meaning competitors (and anyone else) can freely use the invention without licensing fees or infringement risk.
How do I get alerted when a 3.5-year maintenance fee patent is about to lapse?
PatentLapse Pro sends you email alerts 6 months, 3 months, and 30 days before any patent you're watching closes its fee window — for $99/mo, a fraction of what enterprise tools like Derwent charge.
Where does the data come from?
All data comes from the official USPTO Patent Maintenance Fee Events (PTMNFEE2) bulk dataset — public domain, no scraping. We process it weekly so you always see the freshest window-close dates.
Can I monitor a competitor's entire patent portfolio?
Yes. PatentLapse Pro lets you set a company-wide watch — you get a single digest of every upcoming lapse across their portfolio. Useful for strategic planning, freedom-to-operate analysis, and product launch timing.
Source: USPTO Patent Maintenance Fee Events (PTMNFEE2) bulk dataset, public domain (data.uspto.gov). Updated 2026-08-30. Always verify patent status on USPTO before acting.
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© 2026 PatentLapse · Data: USPTO public domain · Updated 2026-08-30 patents@regulation.group