Maintenance fees coming due

Kerr Machine Co.

20 maintenance fees come due in the 12 months from Nov 14, 2026, the next on Dec 27, 2026. Unpaid by Jun 28, 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 11,686,296	Fluid Routing Plug Kerr Machine Co. In force Fee due Dec 27, 2026 Lapses if unpaid Jun 28, 2027 Term ends Nov 18, 2040 · High confidence	Kerr Machine Co.	In force	Dec 27, 2026	Jun 28, 2027	Term ends Nov 18, 2040	High confidence
US 11,708,830	Multi-Piece Fluid End Kerr Machine Co. In force Fee due Jan 25, 2027 Lapses if unpaid Jul 26, 2027 Term ends Nov 20, 2039 · High confidence	Kerr Machine Co.	In force	Jan 25, 2027	Jul 26, 2027	Term ends Nov 20, 2039	High confidence
US 11,788,527	Fluid End Kerr Machine Co. In force Fee due Apr 17, 2027 Lapses if unpaid Oct 18, 2027 Ends no later than Dec 10, 2039 · Medium confidence	Kerr Machine Co.	In force	Apr 17, 2027	Oct 18, 2027	Ends no later than Dec 10, 2039	Medium confidence
US 11,808,254	Fluid End Assembly Kerr Machine Co. In force Fee due May 7, 2027 Lapses if unpaid Nov 8, 2027 Term ends Nov 18, 2040 · High confidence	Kerr Machine Co.	In force	May 7, 2027	Nov 8, 2027	Term ends Nov 18, 2040	High confidence
US 11,808,364	Valve Body Kerr Machine Co. In force Fee due May 7, 2027 Lapses if unpaid Nov 8, 2027 Term ends Nov 10, 2042 · High confidence	Kerr Machine Co.	In force	May 7, 2027	Nov 8, 2027	Term ends Nov 10, 2042	High confidence
US 11,846,282	High Pressure Pump Kerr Machine Co. In force Fee due Jun 19, 2027 Lapses if unpaid Dec 20, 2027 Term ends Nov 18, 2040 · High confidence	Kerr Machine Co.	In force	Jun 19, 2027	Dec 20, 2027	Term ends Nov 18, 2040	High confidence
US 10,519,950	Modular Gland Arrangements For A Fluid End Assembly Kerr Machine Co. In force Fee due Jun 30, 2027 Lapses if unpaid Jan 3, 2028 Term ends Dec 4, 2037 · High confidence	Kerr Machine Co.	In force	Jun 30, 2027	Jan 3, 2028	Term ends Dec 4, 2037	High confidence
US 11,859,601	Fluid Routing Plug Kerr Machine Co. In force Fee due Jul 2, 2027 Lapses if unpaid Jan 3, 2028 Term ends Nov 18, 2040 · High confidence	Kerr Machine Co.	In force	Jul 2, 2027	Jan 3, 2028	Term ends Nov 18, 2040	High confidence
US 11,859,611	Fluid Routing Plug Kerr Machine Co. In force Fee due Jul 2, 2027 Lapses if unpaid Jan 3, 2028 Term ends Nov 18, 2040 · Medium confidence	Kerr Machine Co.	In force	Jul 2, 2027	Jan 3, 2028	Term ends Nov 18, 2040	Medium confidence
US 11,859,732	Sealing High Pressure Flow Devices Kerr Machine Co. In force Fee due Jul 2, 2027 Lapses if unpaid Jan 3, 2028 Term ends Sep 29, 2036 · High confidence	Kerr Machine Co.	In force	Jul 2, 2027	Jan 3, 2028	Term ends Sep 29, 2036	High confidence
10 more maintenance fees coming due in the 12 months from Nov 14, 2026 · Pro

10 of 20 patents shown. Soonest fee due date first, then patent number.

Pro members see every patent with a maintenance fee coming due: number, title, status, the due date, and the date it lapses if the fee goes unpaid through the grace period.

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Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.