112 patents currently held
11 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.
4 more records may belong here and await a decision; they are not counted.
The next term ends in Dec 2026. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
36
Ending by 2030
Dec 2026
Next term end
108
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 15, 2026 · includes USPTO assignment & status data published Nov 15, 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 Jun 2041 · High confidence
Also notable
Ends May 2028 · High confidence
Also notable
Ends Apr 2033 · High confidence
Rail Buckle Detection and Risk Prediction
US 11,834,082
Cited by 18 later US patents, top 5% of utility patents granted in 2023 in our data. Protection runs to 2041.
Rail Sensing Apparatus and Method
US 8,305,567
The most cited patent in this portfolio, cited by 80 later US patents, top 10% of utility patents granted in 2012 in our data. Protection runs to 2028.
Camera, Computer Program and Method for Measuring Thermal Radiation and Thermal Rates of Change
US 9,000,371
Cited by 30 later US patents, top 25% of utility patents granted in 2015 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2033.
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 Dec 9 to 30, 2026 · next Dec 9
- 3 fees due Jan 7 to 28, 2027 · next Jan 7
- 2 fees due Feb 22 to 27, 2027 · next Feb 22
- 2 fees due Mar 5 to 8, 2027 · next Mar 5
- 4 fees due Apr 6 to 29, 2027 · next Apr 6
- 1 fee due May 24, 2027The maintenance fee for Ballast for Locomotives (US 9,193,363) comes due May 24, 2027. Unpaid by Nov 24, 2027, it lapses early.
- 2 fees due Jun 5 to 30, 2027 · next Jun 5
- 1 fee due Jul 2, 2027The maintenance fee for System and Method for Controlling Operations of a Train Using Energy Management Machine Learning Models (US 11,858,543) comes due Jul 2, 2027. Unpaid by Jan 3, 2028, it lapses early.
- 1 fee due Aug 16, 2027The maintenance fee for Crashworthy Memory Module Having a Crack Repair System (US 9,263,358) comes due Aug 16, 2027. Unpaid by Feb 16, 2028, it lapses early.
- 2 fees due Sep 5 to 29, 2027 · next Sep 5
Recent changes
- 1 term has ended since Aug 17, 2026
What they patent
The 5 largest of its 108 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Camera, Computer Program and Method for Measuring Thermal Radiation and Thermal Rates of Change | 3 in force | to Apr 2033 |
| Continuously Variable Dynamic Brake for a Locomotive | 2 in force | to Jul 2032 |
| Apparatus and Method for Identifying a Defect And/Or Operating Characteristic of a System | 2 in force | to Jun 2027 |
| Anti-Wiggle Clip Shoulder for Rail Fastener | 1 in force | to Feb 2045 |
| Track Rail Fastening System and Rail Cushion for Same | 1 in force | to Dec 2044 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,975,934 | Rail Insulators In force · Medium confidence | In force | Medium confidence | |
| US 8,430,363 | Train Wheel Bearing Temperature Detection In force · High confidence | In force | High confidence | |
| US 7,575,201 | System and Method for Detecting a Change or an Obstruction to a Railway Track In force · High confidence | In force | High confidence | |
| US 7,752,015 | Method and Apparatus for Monitoring Bearings In force · High confidence | In force | High confidence | |
| US 7,693,673 | Apparatus and Method for Identifying a Defect And/Or Operating Characteristic of a System In force · High confidence | In force | High confidence | |
| US 8,160,832 | Apparatus and Method for Identifying a Defect And/Or Operating Characteristic of a System In force · High confidence | In force | High confidence | |
| US 7,467,748 | System, Method, and Apparatus for Railroad Guide Rail Support In force · High confidence | In force | High confidence | |
| US 7,533,829 | Rail-Mounting Assembly In force · High confidence | In force | High confidence | |
| US 7,952,306 | Power System with Multiple Generator Units In force · High confidence | In force | High confidence | |
| US 7,793,891 | Railway Diamond Crossing In force · High confidence | In force | High confidence |
Also on record, not counted in the 112: 11 patents in force now held by others · 42 patents ended · 4 applications pending · 38 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.