83 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.
21 more records may belong here and await a decision; they are not counted.
The next term ends in Nov 2026. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
9
Ending by 2030
Nov 2026
Next term end
36
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 Oct 2030 · High confidence
Also notable
Ends Dec 2032 · High confidence
Also notable
Ends Dec 2031 · High confidence
Battery Separators with Cross Ribs and Related Methods
US 9,935,302
The most cited patent in this portfolio, cited by 67 later US patents, top 5% of utility patents granted in 2018 in our data. Protection runs to 2030.
Lead Acid Battery Separators, Batteries and Related Methods
US 11,552,370
Cited by 38 later US patents, top 5% of utility patents granted in 2023 in our data. Protection runs to 2032.
Batteries, Separators, Components, and Compositions with Heavy Metal Removal Capability and Related Methods
US 9,683,101
Cited by 32 later US patents, top 10% of utility patents granted in 2017 in our data, and renewed at every maintenance window due so far. Protection runs to 2031.
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.
- 2 fees due Nov 16 to 30, 2026 · next Nov 16
- 1 fee due Dec 25, 2026The maintenance fee for Batteries, Separators, Components, and Compositions with Heavy Metal Removal Capability and Related Methods (US 10,329,425) comes due Dec 25, 2026. Unpaid by Jun 25, 2027, it lapses early.
- 2 fees due Jan 18, 2027
- 2 fees due Feb 20 to 28, 2027 · next Feb 20
- 1 fee due Mar 26, 2027The maintenance fee for Microporous Membranes, Underlayment, Roofing, Flashing, Wrap, and Methods for Making and Using the Same (US 11,766,642) comes due Mar 26, 2027. Unpaid by Sep 27, 2027, it lapses early.
- 1 fee due May 17, 2027The maintenance fee for Lead-Acid Battery Separator Having Enhanced Stiffness (US 9,190,648) comes due May 17, 2027. Unpaid by Nov 17, 2027, it lapses early.
- 2 fees due Jun 12, 2027
- 3 fees due Jul 2 to 23, 2027 · next Jul 2
- 2 fees due Aug 16 to 27, 2027 · next Aug 16
- 2 fees due Sep 26, 2027
- 1 fee due Nov 7, 2027The maintenance fee for Separators, Batteries, Systems, and Methods for Idle Start Stop Vehicles (US 11,976,197) comes due Nov 7, 2027. Unpaid by May 8, 2028, it lapses early.
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 36 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 10,361,416 | Battery Separator for Extending the Cycle Life of a Battery In force · High confidence | In force | High confidence | |
| US 11,563,256 | Method of Making a Microporous Material In force · High confidence | In force | High confidence | |
| US 9,725,566 | Microporous Material and a Method of Making Same In force · Medium confidence | In force | Medium confidence | |
| US 9,190,648 | Lead-Acid Battery Separator Having Enhanced Stiffness In force · High confidence | In force | High confidence | |
| US 8,027,147 | Ultracapacitor and Method of Manufacturing the Same In force · High confidence | In force | High confidence | |
| US 10,186,701 | Battery Separator for a Storage Battery In force · High confidence | In force | High confidence | |
| US 9,935,302 | Battery Separators with Cross Ribs and Related Methods In force · High confidence | In force | High confidence | |
| US 10,833,306 | Battery Separators with Cross Ribs and Related Methods In force · High confidence | In force | High confidence | |
| US 12,237,534 | Battery Separators with Cross Ribs and Related Methods In force · High confidence | In force | High confidence | |
| US 10,329,425 | Batteries, Separators, Components, and Compositions with Heavy Metal Removal Capability and Related Methods In force · High confidence | In force | High confidence |
Also on record, not counted in the 83: 1 patent in force now held by others · 23 patents ended · 32 applications pending · 23 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.