91 patents currently held
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
23 more records may belong here and await a decision; they are not counted.
The next term ends in Feb 2033. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
0
Ending by 2030
Feb 2033
Next term end
48
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 Mar 2039 · Medium confidence
Also notable
Ends Nov 2034 · High confidence
Also notable
Ends Sep 2033 · High confidence
Systems and Methods for Power Management and Control
US 10,821,843
Cited by 44 later US patents, top 5% of utility patents granted in 2020 in our data. Protection runs to 2039.
Systems and Methods for Forming and Maintaining a High Performance FRC
US 10,049,774
Cited by 49 later US patents, top 5% of utility patents granted in 2018 in our data, and renewed at every maintenance window due so far. Protection runs to 2034.
Negative Ion-Based Neutral Beam Injector
US 9,924,587
Cited by 45 later US patents, top 10% of utility patents granted in 2018 in our data, and renewed at every maintenance window due so far. Protection runs to 2033. A terminal disclaimer caps this term to an earlier patent's.
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 13, 2026The maintenance fee for Neutron Generating Target for Neutron Beam Systems (US 11,678,430) comes due Dec 13, 2026. Unpaid by Jun 14, 2027, it lapses early.
- 2 fees due Feb 6 to 27, 2027 · next Feb 6
- 1 fee due Mar 17, 2027The maintenance fee for Systems and Methods for Reducing Undesired Eddy Currents (US 10,418,170) comes due Mar 17, 2027. Unpaid by Sep 17, 2027, it lapses early.
- 3 fees due Apr 8 to 24, 2027 · next Apr 8
- 1 fee due May 28, 2027The maintenance fee for Systems, Devices, and Methods for Rail-Based and Other Electric Vehicles with Modular Cascaded Energy Systems (US 11,827,115) comes due May 28, 2027. Unpaid by Nov 29, 2027, it lapses early.
- 3 fees due Jun 12 to 19, 2027 · next Jun 12
- 4 fees due Jul 23 to 30, 2027 · next Jul 23
- 6 fees due Aug 6 to 13, 2027 · next Aug 6
- 3 fees due Sep 5 to 26, 2027 · next Sep 5
- 3 fees due Oct 23 to 30, 2027 · next Oct 23
Recent changes
- 3 of the patents on this record were granted since Aug 16, 2026
What they patent
The 5 largest of its 48 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Module-Based Energy Systems Having Converter-Source Modules and Methods Related Thereto | 5 in force | to Mar 2040 |
| Negative Ion-Based Neutral Beam Injector | 5 in force | to Sep 2033 |
| Systems and Methods for Power Management and Control | 4 in force | to Mar 2039 |
| Multi-Level Hysteresis Voltage Controllers for Voltage Modulators and Methods for Control Thereof | 4 in force | to Jun 2038 |
| Systems and Methods for Merging and Compressing Compact Tori | 4 in force | to Oct 2035 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 9,324,897 | Conversion of High-Energy Photons into Electricity In force · High confidence | In force | High confidence | |
| US 9,591,740 | Negative Ion-Based Neutral Beam Injector In force · High confidence | In force | High confidence | |
| US 9,924,587 | Negative Ion-Based Neutral Beam Injector In force · High confidence | In force | High confidence | |
| US 10,398,016 | Negative Ion-Based Beam Injector In force · High confidence | In force | High confidence | |
| US 10,887,976 | Negative Ion-Based Beam Injector In force · Medium confidence | In force | Medium confidence | |
| US 11,363,708 | Negative Ion-Based Beam Injector In force · Medium confidence | In force | Medium confidence | |
| US 10,665,745 | Magnetically Polarized Photonic Device In force · High confidence | In force | High confidence | |
| US 10,438,702 | Systems and Methods for Forming and Maintaining a High Performance FRC In force · Medium confidence | In force | Medium confidence | |
| US 10,440,806 | Systems and Methods for Forming and Maintaining a High Performance FRC In force · High confidence | In force | High confidence | |
| US 10,743,398 | Systems and Methods for Forming and Maintaining a High Performance FRC In force · High confidence | In force | High confidence |
Also on record, not counted in the 91: 5 patents ended · 52 applications pending · 8 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.