NR Engineering Co., Ltd.
2 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.
0
Ending by 2030
Oct 2033
Next term end
When these terms end
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.
- 3 fees due Feb 13 to 27, 2027 · next Feb 13
- 2 fees due Mar 17, 2027
- 2 fees due Apr 29, 2027
- 1 fee due May 12, 2027The maintenance fee for Method and system for fault positioning and recovery of voltage source converter (US 10,476,261) comes due May 12, 2027. Unpaid by Nov 12, 2027, it lapses early.
- 1 fee due Jun 30, 2027The maintenance fee for Reconfigurable MMC sub-module unit and control unit thereof (US 10,523,131) comes due Jun 30, 2027. Unpaid by Jan 3, 2028, it lapses early.
- 2 fees due Jul 14 to 23, 2027 · next Jul 14
- 3 fees due Oct 28, 2027
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 9,640,981 | Frequency-conversion differential protection method for output transformer of static frequency converter system In force · From the USPTO record | In force | From the USPTO record | |
| US 9,362,734 | Apparatus for limiting current of line or breaking current, and control method thereof In force · From the USPTO record | In force | From the USPTO record | |
| US 9,634,476 | Apparatus for breaking line bidirectional current and control method thereof In force · From the USPTO record | In force | From the USPTO record | |
| US 10,396,561 | Coordination control method of multi-terminal VSC-HVDC transmission system In force · From the USPTO record | In force | From the USPTO record | |
| US 9,584,007 | Current source converter differential protection method and relay protection device In force · From the USPTO record | In force | From the USPTO record | |
| US 9,876,393 | Direct current (DC) voltage control method and apparatus In force · From the USPTO record | In force | From the USPTO record | |
| US 10,164,428 | Voltage-Source Multi-Level Converter, DC Power Transmission System, and Fault Processing Method and Device In force · High confidence | In force | High confidence | |
| US 10,283,965 | Method for Incorporating Non-Operating Station into Operating System in Multi-Terminal Flexible DC Transmission System In force · High confidence | In force | High confidence | |
| US 9,876,420 | Sub-module distributed control method, device and system In force · From the USPTO record | In force | From the USPTO record | |
| US 10,218,184 | Method for inhibiting multiple inverter stations from entering passive control mode in island state In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 40: 2 patents in force now held by others · 18 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.
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 no status recorded