Mitsui E&S du Co., Ltd.

21 patents currently held · Updated Nov 14, 2026

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

Ending by 2030

Jan 2029

Next term end

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027202820292030203120322033203420352036203720382039204020412042204320442045

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 Feb 6, 2027
The maintenance fee for Uniflow Scavenging Two-Cycle Engine (US 10,371,042) comes due Feb 6, 2027. Unpaid by Aug 6, 2027, it lapses early.
2 fees due Jun 3 to 10, 2027 · next Jun 3
1 fee due Aug 20, 2027
The maintenance fee for Magnetic Material Concentration Measuring Device (US 11,906,465) comes due Aug 20, 2027. Unpaid by Feb 22, 2028, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

Nothing was recorded against this company's patents in the last 90 days.

Patents held now

Soonest term end first. Each date below is computed on that patent's own page, which shows the rule, the adjustments and the fee history it was derived from.

Patent	Title	Status	Expires	Confidence
US 8,115,478	Device and Method for Measuring Concentration of Magnetic Material In force Term ends Jan 30, 2029 · High confidence	In force	Term ends Jan 30, 2029	High confidence
US 10,689,743	Piston Ring In force Term ends Aug 11, 2033 · Medium confidence	In force	Term ends Aug 11, 2033	Medium confidence
US 9,556,818	Two-Stroke Uniflow Engine In force Term ends Aug 14, 2033 · High confidence	In force	Term ends Aug 14, 2033	High confidence
US 9,810,142	Uniflow-Scavenging-Type Two-Cycle Engine In force Term ends Jan 24, 2034 · High confidence	In force	Term ends Jan 24, 2034	High confidence
US 9,790,843	Uniflow Scavenging 2-Cycle Engine In force Term ends Aug 11, 2034 · High confidence	In force	Term ends Aug 11, 2034	High confidence
US 9,605,590	Crosshead Engine In force Term ends Jan 19, 2035 · High confidence	In force	Term ends Jan 19, 2035	High confidence
US 10,087,831	Engine In force Term ends Apr 21, 2035 · High confidence	In force	Term ends Apr 21, 2035	High confidence
US 10,496,056	Measured Value Analysis Apparatus and Measured Value Analysis Method In force Term ends Sep 2, 2035 · High confidence	In force	Term ends Sep 2, 2035	High confidence
US 10,371,042	Uniflow Scavenging Two-Cycle Engine In force Term ends Mar 27, 2036 · High confidence	In force	Term ends Mar 27, 2036	High confidence
US 10,502,120	Uniflow-Scavenged Two-Cycle Engine In force Term ends May 15, 2036 · High confidence	In force	Term ends May 15, 2036	High confidence

10 of 21 patents shown.

Pro members see all 21.

Pro members: see all 21 patents

Also on record, not counted in the 21: 1 lapsed for an unpaid fee. List them

Sources and methods

Compiled from the USPTO record, grants, published applications and recorded assignments, not yet reviewed by hand. How this record was built

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

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