73 patents currently held
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
The next term ends in Feb 2027. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
6
Ending by 2030
Feb 2027
Next term end
51
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 Jun 2036 · High confidence
Also notable
Ends Dec 2030 · High confidence
Also notable
Ends Jun 2036 · High confidence
Guided Surface Wave Transmission of Multiple Frequencies in a Lossy Media
US 9,882,397
The most cited patent in this portfolio, cited by 212 later US patents, top 1% of utility patents granted in 2018 in our data. Protection runs to 2036.
Parametric Power Multiplication
US 9,118,216
Cited by 84 later US patents, top 5% of utility patents granted in 2015 in our data, and renewed at every maintenance window due so far. Protection runs to 2030.
Simultaneous Transmission and Reception of Guided Surface Waves
US 10,074,993
Cited by 136 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 2036.
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.
- 7 fees due Dec 4 to 25, 2026 · next Dec 4
- 2 fees due Jan 16, 2027
- 3 fees due Feb 13 to 27, 2027 · next Feb 13
- 4 fees due Mar 3 to 24, 2027 · next Mar 3
- 1 fee due Apr 15, 2027The maintenance fee for Arrangements for Coupling the Primary Coil to the Secondary Coil (US 10,447,342) comes due Apr 15, 2027. Unpaid by Oct 15, 2027, it lapses early.
- 4 fees due Jun 3 to 24, 2027 · next Jun 3
- 1 fee due Jul 14, 2027The maintenance fee for Load Shedding in a Guided Surface Wave Power Delivery System (US 10,536,037) comes due Jul 14, 2027. Unpaid by Jan 14, 2028, it lapses early.
- 2 fees due Aug 11, 2027
- 1 fee due Sep 3, 2027The maintenance fee for Heat Management Around a Phase Delay Coil in a Probe (US 10,581,492) comes due Sep 3, 2027. Unpaid by Mar 3, 2028, it lapses early.
Recent changes
- 1 term has ended since Aug 16, 2026
What they patent
The 5 largest of its 51 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Systems and Methods for Electrical Power Multiplication | 4 in force | to Jan 2032 |
| Adaptation of Polyphase Waveguide Probes | 3 in force | to Jun 2036 |
| Measuring and Reporting Power Received from Guided Surface Waves | 3 in force | to Jan 2036 |
| Return Coupled Wireless Power Transmission | 3 in force | to Dec 2035 |
| Multiply-Connected Power Processing | 3 in force | to Aug 2029 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,969,042 | Application of Power Multiplication to Electric Power Distribution In force · High confidence | In force | High confidence | |
| US 9,396,921 | Method and Apparatus for Pyrolysis-Induced Cleavage in Peptides and Proteins In force · Low confidence | In force | Low confidence | |
| US 8,716,890 | Multiply-Connected Power Processing In force · High confidence | In force | High confidence | |
| US 9,923,373 | Multiply-Connected Power Processing In force · High confidence | In force | High confidence | |
| US 9,407,095 | Multiply-Connected Power Processing In force · High confidence | In force | High confidence | |
| US 9,118,216 | Parametric Power Multiplication In force · High confidence | In force | High confidence | |
| US 8,638,182 | Systems and Methods for Electrical Power Multiplication In force · High confidence | In force | High confidence | |
| US 8,629,734 | Systems and Methods for Power Smoothing in Power Distribution In force · High confidence | In force | High confidence | |
| US 9,997,040 | Global Emergency and Disaster Transmission In force · High confidence | In force | High confidence | |
| US 10,132,845 | Measuring and Reporting Power Received from Guided Surface Waves In force · High confidence | In force | High confidence |
Also on record, not counted in the 73: 7 patents ended · 20 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.