72 patents currently held
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
1 more record may belong here and awaits a decision; it is not counted.
The next term ends in Aug 2028. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
1
Ending by 2030
Aug 2028
Next term end
53
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 Jul 2038 · Medium confidence
Also notable
Ends Nov 2036 · High confidence
Also notable
Ends Oct 2037 · High confidence
Polyamide Nanofiber Nonwovens for Filters
US 11,376,534
The most cited patent in this portfolio, cited by 40 later US patents, top 5% of utility patents granted in 2022 in our data. Protection runs to 2038. A terminal disclaimer caps this term to an earlier patent's.
Copolyamide Compositions with Reduced Crystallization Rates
US 10,836,863
The earliest of the three still in force, granted 2020 and renewed since. Its term ends first, in 2036.
Low-Halogen Flame Retardant Polyamide Compositions Resistant to Heat Aging
US 10,836,904
The earliest of the three still in force, granted 2020 and renewed since. Its term ends first, in 2037.
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 Dec 13 to 20, 2026 · next Dec 13
- 1 fee due Jan 25, 2027The maintenance fee for Methods for Stabilizing Water Sensitive Clays and Migrating Fines in Subterranean Formations (US 11,708,523) comes due Jan 25, 2027. Unpaid by Jul 26, 2027, it lapses early.
- 1 fee due Feb 28, 2027The maintenance fee for Electrolyte Solutions (US 11,742,523) comes due Feb 28, 2027. Unpaid by Aug 30, 2027, it lapses early.
- 2 fees due Mar 12 to 19, 2027 · next Mar 12
- 4 fees due Apr 3 to 17, 2027 · next Apr 3
- 1 fee due May 14, 2027The maintenance fee for Process for Recovering Acetonitrile (US 11,814,337) comes due May 14, 2027. Unpaid by Nov 15, 2027, it lapses early.
- 2 fees due Jun 26, 2027
- 1 fee due Sep 17, 2027The maintenance fee for Polymerization Coupled Compounding Process (US 10,590,245) comes due Sep 17, 2027. Unpaid by Mar 17, 2028, it lapses early.
- 1 fee due Oct 23, 2027The maintenance fee for Method For Forming Nanofiber Nonwoven Products (US 11,965,275) comes due Oct 23, 2027. Unpaid by Apr 24, 2028, it lapses early.
- 1 fee due Nov 7, 2027The maintenance fee for Acetonitrile Separation Process (US 11,976,025) comes due Nov 7, 2027. Unpaid by May 8, 2028, it lapses early.
Recent changes
- 2 of the patents on this record were granted since Aug 16, 2026
What they patent
The 5 largest of its 53 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Polyamide Nanofiber Nonwovens | 5 in force | to Sep 2038 |
| Polymerization Coupled Compounding Process | 4 in force | to Mar 2034 |
| Antimicrobial Nonwoven Polyamides with Zinc Content | 2 in force | to Oct 2041 |
| Tricyanohexane Purification Methods | 2 in force | to Mar 2041 |
| Processes for Stabilizing Antimony Catalysts | 2 in force | to Mar 2040 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,763,225 | Process of Catalytic Ammoxidation for Hydrogen Cyanide Production In force · High confidence | In force | High confidence | |
| US 10,077,341 | Polymerization Coupled Compounding Process In force · High confidence | In force | High confidence | |
| US 10,081,712 | Polymerization Coupled Compounding Process In force · High confidence | In force | High confidence | |
| US 10,590,245 | Polymerization Coupled Compounding Process In force · High confidence | In force | High confidence | |
| US 11,447,609 | Polymerization Coupled Compounded Nylon In force · High confidence | In force | High confidence | |
| US 10,865,288 | Low Phosphorus Low Color Polyamides In force · High confidence | In force | High confidence | |
| US 10,836,863 | Copolyamide Compositions with Reduced Crystallization Rates In force · High confidence | In force | High confidence | |
| US 12,612,491 | High Molecular Weight Polyamides and CoPolyamides with Uniform RV and Low Gel Content In force · High confidence | In force | High confidence | |
| US 11,753,504 | Copolyamide Compositions with Reduced Crystallization Rates In force · High confidence | In force | High confidence | |
| US 10,836,904 | Low-Halogen Flame Retardant Polyamide Compositions Resistant to Heat Aging In force · High confidence | In force | High confidence |
Also on record, not counted in the 72: 12 patents ended · 25 applications pending · 30 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.