Maintenance fees coming due

Phio Pharmaceuticals Corp.

7 maintenance fees come due in the 12 months from Nov 15, 2026, the next on Dec 6, 2026. Unpaid by Jun 7, 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 11,667,915	RNA Duplexes with Single Stranded Phosphorothioate Nucleotide Regions for Additional Functionality Phio Pharmaceuticals Corp. In force Fee due Dec 6, 2026 Lapses if unpaid Jun 7, 2027 Ends no later than Feb 4, 2030 · Medium confidence	Phio Pharmaceuticals Corp.	In force	Dec 6, 2026	Jun 7, 2027	Ends no later than Feb 4, 2030	Medium confidence
US 9,074,211	Inhibition of MAP4K4 Through Rnai Phio Pharmaceuticals Corp. In force Fee due Jan 7, 2027 Lapses if unpaid Jul 7, 2027 Term ends Jun 6, 2030 · High confidence	Phio Pharmaceuticals Corp.	In force	Jan 7, 2027	Jul 7, 2027	Term ends Jun 6, 2030	High confidence
US 9,080,171	Reduced Size Self-Delivering Rnai Compounds Phio Pharmaceuticals Corp. In force Fee due Jan 14, 2027 Lapses if unpaid Jul 14, 2027 Term ends Jun 22, 2031 · High confidence	Phio Pharmaceuticals Corp.	In force	Jan 14, 2027	Jul 14, 2027	Term ends Jun 22, 2031	High confidence
US 9,095,504	RNA Interference in Ocular Indications Phio Pharmaceuticals Corp. In force Fee due Feb 4, 2027 Lapses if unpaid Aug 4, 2027 Term ends Mar 29, 2031 · High confidence	Phio Pharmaceuticals Corp.	In force	Feb 4, 2027	Aug 4, 2027	Term ends Mar 29, 2031	High confidence
US 9,175,289	Reduced Size Self-Delivering Rnai Compounds Phio Pharmaceuticals Corp. In force Fee due May 3, 2027 Lapses if unpaid Nov 3, 2027 Ends no later than Sep 22, 2029 · Medium confidence	Phio Pharmaceuticals Corp.	In force	May 3, 2027	Nov 3, 2027	Ends no later than Sep 22, 2029	Medium confidence
US 10,479,992	RNA Duplexes with Single Stranded Phosphorothioate Nucleotide Regions for Additional Functionality Phio Pharmaceuticals Corp. In force Fee due May 19, 2027 Lapses if unpaid Nov 19, 2027 Ends no later than Feb 4, 2030 · Medium confidence	Phio Pharmaceuticals Corp.	In force	May 19, 2027	Nov 19, 2027	Ends no later than Feb 4, 2030	Medium confidence
US 11,926,828	Methods for Treating Aging and Skin Disorders Using Nucleic Acids Targeting Tyr or MMP1 Phio Pharmaceuticals Corp. In force Fee due Sep 12, 2027 Lapses if unpaid Mar 13, 2028 Term ends Nov 22, 2035 · High confidence	Phio Pharmaceuticals Corp.	In force	Sep 12, 2027	Mar 13, 2028	Term ends Nov 22, 2035	High confidence

7 of 7 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.