Electric Power Development Co., Ltd.

14 patents currently held · Updated Nov 15, 2026

4 more in force are now held by other companies

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

Recorded under 2 name spellings.

Ending by 2030

Mar 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 Jul 26, 2027
The maintenance fee for In-furnace temperature measurement device (US 9,243,961) comes due Jul 26, 2027. Unpaid by Jan 26, 2028, it lapses early.
1 fee due Oct 2, 2027
The maintenance fee for Wind Energy Generation System (US 11,946,455) comes due Oct 2, 2027. Unpaid by Apr 3, 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 8,490,556	Method and Facility for Feeding Carbon Dioxide to Oxyfuel Combustion Boiler In force Term ends Mar 2, 2029 · High confidence	In force	Term ends Mar 2, 2029	High confidence
US 8,550,016	Method and Apparatus of Controlling Flow Rate of Primary Recirculating Exhaust Gas in Oxyfuel Combustion Boiler In force Term ends Mar 5, 2029 · High confidence	In force	Term ends Mar 5, 2029	High confidence
US 8,550,017	Method and Apparatus of Controlling Exhaust Gas in Oxyfuel Combustion Boiler In force Term ends Apr 8, 2029 · High confidence	In force	Term ends Apr 8, 2029	High confidence
US 8,601,960	Method and Apparatus of Controlling Exhaust Gas in Oxyfuel Combustion Boiler In force Term ends May 21, 2029 · High confidence	In force	Term ends May 21, 2029	High confidence
US 8,662,884	Method and Apparatus of Controlling Oxygen Supply for Boiler In force Term ends Jan 11, 2030 · High confidence	In force	Term ends Jan 11, 2030	High confidence
US 9,429,315	Method and Apparatus of Controlling Oxygen Supply in Oxyfuel Combustion Boiler In force Term ends Feb 17, 2030 · High confidence	In force	Term ends Feb 17, 2030	High confidence
US 8,927,285	Micro-alga belonging to genus Navicula, process for production of oil by culture of the micro-alga, and oil collected from the micro-alga In force Term ends Jun 21, 2030 · From the USPTO record	In force	Term ends Jun 21, 2030	From the USPTO record
US 8,584,604	Method and Apparatus for Controlling Combustion in Oxygen Fired Boiler In force Term ends Jul 8, 2030 · High confidence	In force	Term ends Jul 8, 2030	High confidence
US 9,810,425	Pulverized Coal Burner for Oxyfuel Combustion Boiler In force Term ends Jan 26, 2031 · High confidence	In force	Term ends Jan 26, 2031	High confidence
US 9,243,961	In-furnace temperature measurement device In force Term ends Nov 12, 2032 · From the USPTO record	In force	Term ends Nov 12, 2032	From the USPTO record

10 of 14 patents shown.

Pro members see all 14.

Pro members: see all 14 patents

Also on record, not counted in the 14: 4 patents in force now held by others · 3 lapsed for an unpaid fee · 30 ended at full term. 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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Published applications

US patent applications published under this name that have not become patents. An application is published about eighteen months after its earliest filing; one that has not been published is in no public record.

6 abandoned · 2 no status recorded

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