306 patents currently held
1 more in force is now held by another company
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
The next term ends in Dec 2026. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
65
Ending by 2030
Dec 2026
Next term end
297
Patent families
When these terms end
Held patents by the year their term ends
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
Ends Feb 2039 · High confidence
Also notable
Ends Dec 2038 · High confidence
Also notable
Ends Dec 2030 · High confidence
Gripping System
US 11,298,818
The most cited patent in this portfolio, cited by 7 later US patents, top 25% of utility patents granted in 2022 in our data. Protection runs to 2039.
Diagnosis System for Ball Screw Unit and Motor Control System
US 11,242,919
The newest of the three, granted 2022. It anchors the portfolio to 2038, later than anything else here.
Linear Stopper
US 9,016,441
Renewed at every maintenance window since the 2015 grant; no more fees are due before its term ends in 2030.
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 25, 2026The maintenance fee for Rolling Guide Device (US 10,330,150) comes due Dec 25, 2026. Unpaid by Jun 25, 2027, it lapses early.
- 3 fees due Jan 16 to 28, 2027 · next Jan 16
- 8 fees due Feb 4 to 27, 2027 · next Feb 4
- 8 fees due Mar 3 to 26, 2027 · next Mar 3
- 6 fees due Apr 1 to 24, 2027 · next Apr 1
- 3 fees due May 5 to 28, 2027 · next May 5
- 6 fees due Jun 3 to 30, 2027 · next Jun 3
- 3 fees due Jul 5 to 30, 2027 · next Jul 5
- 8 fees due Aug 2 to 27, 2027 · next Aug 2
- 5 fees due Sep 1 to 30, 2027 · next Sep 1
- 8 fees due Oct 7 to 30, 2027 · next Oct 7
Recent changes
- 6 of the patents on this record were granted since Aug 16, 2026
- 2 terms have ended since Aug 16, 2026
What they patent
The 5 largest of its 297 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Linear Stopper | 3 in force | to Dec 2030 |
| Mobile Robot, Mobile Robot Control System, and Mobile Robot Control Method | 2 in force | to Jul 2040 |
| Robot Arm Apparatus | 2 in force | to Jan 2038 |
| Motion Guide Device and Actuator | 2 in force | to Nov 2036 |
| End Plate for Motion Guide Device | 2 in force | to Apr 2036 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,888,827 | Linear Synchronous Motor and Linear Motor Actuator In force · High confidence | In force | High confidence | |
| US 7,946,013 | Jig for Driving Closing Cap for Bolt Installation Hole held by THK Co., Ltd. and THK GmbH In force · High confidence | In force | High confidence | |
| US 7,819,894 | Manipulator with Multiple Degrees of Freedom held by Mitsuishi, Mamoru and THK Co., Ltd. In force · High confidence | In force | High confidence | |
| US 7,798,719 | Method of Manufacturing Linear Guide Device and Track Rail for the Linear Guide Device In force · High confidence | In force | High confidence | |
| US 7,950,304 | Roller Screw In force · High confidence | In force | High confidence | |
| US 7,878,992 | Power Assistance Controlling Apparatus, Power Assistance Controlling Method, and Physiotherapy Apparatus held by Mitsuishi, Mamoru and THK Co., Ltd. In force · High confidence | In force | High confidence | |
| US 8,214,160 | State Detection Device, State Detection Method, State Detection Program, and Information Recording Medium In force · High confidence | In force | High confidence | |
| US 8,167,493 | Ball Spline In force · High confidence | In force | High confidence | |
| US 8,143,750 | A Linear Motor Having Coils Surrounding an Axially Moving Magnetic Rod In force · High confidence | In force | High confidence | |
| US 7,819,584 | Guide Apparatus In force · High confidence | In force | High confidence |
Also on record, not counted in the 306: 1 patent in force now held by others · 112 patents ended · 47 applications pending · 62 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.