TPR Co., Ltd.
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.
0
Ending by 2030
Mar 2031
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.
- 1 fee due Dec 20, 2026The maintenance fee for Cylinder liner and cylinder bore (US 11,680,537) comes due Dec 20, 2026. Unpaid by Jun 21, 2027, it lapses early.
- 1 fee due Jan 28, 2027The maintenance fee for Cylinder liner for insert casting use (US 9,089,893) comes due Jan 28, 2027. Unpaid by Jul 28, 2027, it lapses early.
- 1 fee due Feb 8, 2027The maintenance fee for Sintered alloy valve guide and method of producing sintered alloy valve guide (US 11,719,138) comes due Feb 8, 2027. Unpaid by Aug 9, 2027, it lapses early.
- 1 fee due Mar 3, 2027The maintenance fee for Method for Producing Porous Graphite, and Porous Graphite (US 10,403,900) comes due Mar 3, 2027. Unpaid by Sep 3, 2027, it lapses early.
- 2 fees due Apr 1 to 22, 2027 · next Apr 1
- 1 fee due May 3, 2027The maintenance fee for Piston ring (US 9,175,771) comes due May 3, 2027. Unpaid by Nov 3, 2027, it lapses early.
- 1 fee due Jun 17, 2027The maintenance fee for Core-Shell Composite, Method for Producing the Same, Electrode Material, Catalyst, Electrode, Secondary Battery, and Electric Double-Layer Capacitor (US 10,510,493) comes due Jun 17, 2027. Unpaid by Dec 17, 2027, it lapses early.
- 2 fees due Jul 9, 2027
- 1 fee due Aug 25, 2027The maintenance fee for Combination oil ring (US 10,571,024) comes due Aug 25, 2027. Unpaid by Feb 25, 2028, it lapses early.
- 1 fee due Sep 24, 2027The maintenance fee for Cast-iron cylindrical member and composite structure (US 10,596,624) comes due Sep 24, 2027. Unpaid by Mar 24, 2028, it lapses early.
- 3 fees due Oct 9 to 28, 2027 · next Oct 9
Recent changes
- 1 term has ended since Aug 16, 2026
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 9,458,933 | Combination oil ring In force · From the USPTO record | In force | From the USPTO record | |
| US 8,801,291 | Support member In force · From the USPTO record | In force | From the USPTO record | |
| US 8,905,202 | Brake drum In force · From the USPTO record | In force | From the USPTO record | |
| US 9,416,434 | High-toughness coating film and sliding member In force · From the USPTO record | In force | From the USPTO record | |
| US 9,175,771 | Piston ring In force · From the USPTO record | In force | From the USPTO record | |
| US 9,581,056 | Valve seat In force · From the USPTO record | In force | From the USPTO record | |
| US 9,726,286 | Combination oil ring In force · From the USPTO record | In force | From the USPTO record | |
| US 9,845,873 | Combination oil ring In force · From the USPTO record | In force | From the USPTO record | |
| US 10,072,755 | Combination oil ring In force · From the USPTO record | In force | From the USPTO record | |
| US 9,089,893 | Cylinder liner for insert casting use In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 65: 4 patents in force now held by others · 1 lapsed for an unpaid fee · 1 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.
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.
2 pending · 3 abandoned · 6 no status recorded