141 patents currently held

Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.

The next term ends in Oct 2034. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Oct 2034

Next term end

Patent families

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

202620272028202920302031203220332034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045

notable patents fee due within 90 days all others Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know

Notable: the highest-ranked patents in this portfolio by citations and family size. Fee due within 90 days: a maintenance fee is due within 90 days of when this page was computed and not yet paid.

Notable patents

Ranked by citations and family size, against patents of the same kind granted the same year. How we rank

Notable

Fluid End US 11,162,479

The most cited patent in this portfolio, cited by 132 later US patents, top 1% of utility patents granted in 2021 in our data. Protection runs to 2040.

Ends Nov 2040 · High confidence Also notable

Tapered Valve Seat US 11,078,903

Cited by 114 later US patents, top 1% of utility patents granted in 2021 in our data. Protection runs to 2038.

Ends Aug 2038 · High confidence Also notable

Fracturing Pump With In-Line Fluid End US 11,578,710

Cited by 30 later US patents, top 5% of utility patents granted in 2023 in our data. Protection runs to 2040.

Ends Jul 2040 · High confidence

Fee deadlines

Maintenance fees fall due 3.5, 7.5 and 11.5 years after grant. A missed fee ends a patent at the end of the six month grace period that follows, not on the due date.

1 fee due Dec 27, 2026
The maintenance fee for Fluid Routing Plug (US 11,686,296) comes due Dec 27, 2026. Unpaid by Jun 28, 2027, it lapses early.
1 fee due Jan 25, 2027
The maintenance fee for Multi-Piece Fluid End (US 11,708,830) comes due Jan 25, 2027. Unpaid by Jul 26, 2027, it lapses early.
1 fee due Apr 17, 2027
The maintenance fee for Fluid End (US 11,788,527) comes due Apr 17, 2027. Unpaid by Oct 18, 2027, it lapses early.
2 fees due May 7, 2027
2 fees due Jun 19 to 30, 2027 · next Jun 19
4 fees due Jul 2 to 21, 2027 · next Jul 2
3 fees due Sep 5 to 17, 2027 · next Sep 5
5 fees due Oct 2 to 23, 2027 · next Oct 2
1 fee due Nov 12, 2027
The maintenance fee for Bellows System For Fluid End (US 10,648,490) comes due Nov 12, 2027. Unpaid by May 12, 2028, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

8 of the patents on this record were granted since Aug 16, 2026

What they patent

The 5 largest of its 30 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Fluid Routing Plug	37 in force	to Oct 2043
Sealing High Pressure Flow Devices	25 in force	to Sep 2038
Modular Power End	15 in force	to Jul 2041
Fracturing Pump With In-Line Fluid End	10 in force	to Jul 2040
Fluid End	5 in force	to Dec 2039

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US D861,834	Valve Seat In force Term ends Oct 1, 2034 · High confidence	In force	Term ends Oct 1, 2034	High confidence
US D880,661	Tapered Valve Seat In force Ends no later than Apr 7, 2035 · Medium confidence	In force	Ends no later than Apr 7, 2035	Medium confidence
US 9,724,794	Machine Tool Protection In force Term ends Jun 13, 2035 · High confidence	In force	Term ends Jun 13, 2035	High confidence
US D916,240	Fluid End In force Term ends Apr 13, 2036 · High confidence	In force	Term ends Apr 13, 2036	High confidence
US D928,917	Fluid End In force Term ends Aug 24, 2036 · High confidence	In force	Term ends Aug 24, 2036	High confidence
US 10,288,178	Sealing High Pressure Flow Devices In force Term ends Sep 29, 2036 · High confidence	In force	Term ends Sep 29, 2036	High confidence
US 10,591,070	Sealing High Pressure Flow Devices In force Term ends Sep 29, 2036 · High confidence	In force	Term ends Sep 29, 2036	High confidence
US 10,895,325	Sealing High Pressure Flow Devices In force Term ends Sep 29, 2036 · High confidence	In force	Term ends Sep 29, 2036	High confidence
US 10,907,738	Sealing High Pressure Flow Devices In force Term ends Sep 29, 2036 · High confidence	In force	Term ends Sep 29, 2036	High confidence
US 11,143,315	Sealing High Pressure Flow Devices In force Term ends Sep 29, 2036 · High confidence	In force	Term ends Sep 29, 2036	High confidence

10 of 141 patents shown.

Pro members see all 141.

Pro members: see all 141 patents

Also on record, not counted in the 141: 29 applications pending · 19 applications abandoned. List them

Sources and methods

Compiled from USPTO application file histories, grants and recorded assignments, with the company's own names reviewed by hand. How this record was built

Portfolio grouped automatically from ownership conveyances to the names matched to this company, usually every name that begins with its own, so it counts patents an affiliate holds; each list row names the holder of record. Security interests are excluded and ambiguous records are not reviewed by hand.

Fee due within 90 days marks a patent with a maintenance fee due within 90 days of the date this page was computed and not yet recorded paid, so it can end earlier than the bar shows. A fee left unpaid ends the patent at the close of the six month grace period that follows its due date, not on the due date itself. It is not a prediction that the fee will be missed.

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

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Kerr Machine Co.