Maintenance fees coming due
4 maintenance fees come due in the 12 months from Nov 14, 2026, the next on Feb 13, 2027. Unpaid by Aug 13, 2027, that one lapses early.
A maintenance fee does not end a patent on its due date. It falls due at 3.5, 7.5
and 11.5 years from grant, and the patent lapses only if the fee is still unpaid at the end of the
six month grace period that follows.
| Patent | Title | Holder | Status | Fee due | Lapses if unpaid | Expires | Confidence |
|---|---|---|---|---|---|---|---|
| US 10,376,442 | Dynamic Sauna In force Fee due Feb 13, 2027 Lapses if unpaid Aug 13, 2027 · Medium confidence | Sunlighten, LLC | In force | Feb 13, 2027 | Aug 13, 2027 | Medium confidence | |
| US 11,857,489 | Sauna System with Communication, Networking, and Global Infrastructure In force Fee due Jul 2, 2027 Lapses if unpaid Jan 3, 2028 · High confidence | Sunlighten, LLC | In force | Jul 2, 2027 | Jan 3, 2028 | High confidence | |
| US 11,865,065 | Folding Sauna Enclosure In force Fee due Jul 9, 2027 Lapses if unpaid Jan 10, 2028 · High confidence | Sunlighten, LLC | In force | Jul 9, 2027 | Jan 10, 2028 | High confidence | |
| US 10,616,955 | Personal Sauna Unit with Integrated Chromotherapy Lighting In force Fee due Oct 7, 2027 Lapses if unpaid Apr 7, 2028 · High confidence | Sunlighten, LLC | In force | Oct 7, 2027 | Apr 7, 2028 | High confidence |
4 of 4 patents shown. Soonest fee due date first, then patent number.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.