105 patents currently held

14 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.

3 more records may belong here and await a decision; they are not counted.

The next term ends in May 2027. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

May 2027

Next term end

Patent families

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042204320442045

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

Lithium Secondary Cell with High Charge and Discharge Rate Capability and Low Impedance Growth US 8,617,745

Cited by 91 later US patents, top 10% of utility patents granted in 2013 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2029.

Ends Jun 2029 · High confidence Also notable

Prismatic Battery Module with Scalable Architecture US 8,409,744

Cited by 85 later US patents, top 10% of utility patents granted in 2013 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2029.

Ends Dec 2029 · High confidence Also notable

Ferric Phosphate and Methods of Preparation Thereof US 9,174,846

Cited by 27 later US patents, top 25% of utility patents granted in 2015 in our data, and renewed at every maintenance window due so far. Protection runs to 2032.

Ends Aug 2032 · High confidence

Formerly held, still cited

Notable

High Energy Density Redox Flow Device US 9,786,944

The most cited patent in this portfolio, cited by 340 later US patents, top 1% of utility patents granted in 2017 in our data. Protection runs to 2031.

now held by Massachusetts Institute of Technology

Ends Sep 2031 · Medium confidence

Also notable

Nanoscale Ion Storage Materials Including Co-Existing Phases or Solid Solutions US 7,939,201

Cited by 64 later US patents, top 10% of utility patents granted in 2011 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2029.

now held by Lithium Werks Technology B.V.

Ends May 2029 · High confidence

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 Nov 16 to 28, 2026 · next Nov 16
2 fees due Dec 6 to 20, 2026 · next Dec 6
1 fee due Mar 26, 2027
The maintenance fee for Multi-Layered Coated Electrode for Lithium-Ion Battery (US 11,769,882) comes due Mar 26, 2027. Unpaid by Sep 27, 2027, it lapses early.
2 fees due Apr 13, 2027
2 fees due May 3, 2027
2 fees due Jun 3 to 30, 2027 · next Jun 3
1 fee due Jul 23, 2027
The maintenance fee for Reverse Bias Protection Circuit for a Vehicle Battery System (US 11,881,707) comes due Jul 23, 2027. Unpaid by Jan 24, 2028, it lapses early.
1 fee due Aug 27, 2027
The maintenance fee for Nanoscale Pore Structure Cathode for High Power Applications and Material Synthesis Methods (US 11,916,185) comes due Aug 27, 2027. Unpaid by Feb 28, 2028, it lapses early.
2 fees due Sep 29, 2027

Which patents, and when each one lapses · Pro

Recent changes

1 of the patents on this record was granted since Aug 16, 2026
1 term has ended since Aug 16, 2026

What they patent

The 5 largest of its 85 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Ferric Phosphate and Methods of Preparation Thereof	5 in force	to Aug 2032
Protection Circuit for Battery Management System	3 in force	to Oct 2041
Nanoscale Pore Structure Cathode for High Power Applications and Material Synthesis Methods	3 in force	to Mar 2037
Electrolyte Formulation for Reduced Gassing Wide Temperature Range Cycling	3 in force	to May 2034
System and Method for Assessing Voltage Threshold Detecting Circuitry Within a Battery Pack	3 in force	to Apr 2032

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 8,067,112	Stacked Lithium Secondary Battery and Its Fabrication Utilizing a Folded Configuration In force Term ends May 23, 2027 · High confidence	In force	Term ends May 23, 2027	High confidence
US 7,879,493	Alkali Metal Titanates and Methods for Their Synthesis In force Term ends Jun 4, 2027 · High confidence	In force	Term ends Jun 4, 2027	High confidence
US 8,323,831	Nanocomposite Electrodes and Related Devices In force Term ends Jun 16, 2027 · High confidence	In force	Term ends Jun 16, 2027	High confidence
US 7,723,955	Method and System for Monitoring and Balancing Cells in Battery Packs Utilizing Optically Coupled Cell Voltage Selection Signal, Cell Voltage Isolation Amplifier, and Zener Diodes in Balancing Circuit In force Term ends May 14, 2028 · High confidence	In force	Term ends May 14, 2028	High confidence
US 9,923,180	Separator Including Electroactive Material for Overcharge Protection In force Term ends Jun 2, 2028 · High confidence	In force	Term ends Jun 2, 2028	High confidence
US 9,509,019	Multifunctional Mixed Metal Olivines for Lithium Ion Batteries In force Term ends Jul 11, 2028 · High confidence	In force	Term ends Jul 11, 2028	High confidence
US 9,728,759	Separator for Electrochemical Cell and Method for Its Manufacture In force Term ends Aug 21, 2028 · High confidence	In force	Term ends Aug 21, 2028	High confidence
US 8,541,122	Lithium Rechargeable Cell with Reference Electrode for State of Health Monitoring In force Term ends Sep 15, 2028 · High confidence	In force	Term ends Sep 15, 2028	High confidence
US 10,497,916	Separator for Electrochemical Cell and Method for Its Manufacture In force Term ends Mar 13, 2029 · High confidence	In force	Term ends Mar 13, 2029	High confidence
US 7,842,420	Electrode Material with Enhanced Ionic Transport Properties In force Ends no later than Mar 27, 2029 · Medium confidence	In force	Ends no later than Mar 27, 2029	Medium confidence

10 of 105 patents shown.

Pro members see all 105.

Pro members: see all 105 patents

Also on record, not counted in the 105: 14 patents in force now held by others · 43 patents ended · 24 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.

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