103 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 Feb 2030. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
2
Ending by 2030
Feb 2030
Next term end
56
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 Dec 2032 · High confidence
Also notable
Ends no later than Aug 2032 · Medium confidence
Also notable
Ends Aug 2032 · High confidence
Exhaust Flow Modifier, Duct Intersection Incorporating the Same, and Methods Therefor
US 10,975,309
Cited by 74 later US patents, top 5% of utility patents granted in 2021 in our data. Protection runs to 2032.
Automatic Draft Control System for Coke Plants
US 11,692,138
Cited by 41 later US patents, top 5% of utility patents granted in 2023 in our data. Protection runs to 2032. A terminal disclaimer is on file and its reference is not resolved, so no cap is applied and the date may move earlier, never later.
Coke Plant Including Exhaust Gas Sharing
US 11,441,077
Cited by 31 later US patents, top 5% of utility patents granted in 2022 in our data. Protection runs to 2032.
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 Dec 4 to 20, 2026 · next Dec 4
- 1 fee due Jan 4, 2027The maintenance fee for Automatic Draft Control System for Coke Plants (US 11,692,138) comes due Jan 4, 2027. Unpaid by Jul 6, 2027, it lapses early.
- 3 fees due Mar 5 to 26, 2027 · next Mar 5
- 3 fees due Apr 17 to 27, 2027 · next Apr 17
- 4 fees due May 7 to 24, 2027 · next May 7
- 4 fees due Jun 19 to 26, 2027 · next Jun 19
- 4 fees due Jul 7 to 26, 2027 · next Jul 7
- 1 fee due Aug 2, 2027The maintenance fee for Method and Apparatus for Volatile Matter Sharing in Stamp-Charged Coke Ovens (US 9,249,357) comes due Aug 2, 2027. Unpaid by Feb 2, 2028, it lapses early.
- 3 fees due Sep 1 to 26, 2027 · next Sep 1
- 3 fees due Oct 2 to 14, 2027 · next Oct 2
Recent changes
- 1 of the patents on this record was granted since Aug 16, 2026
What they patent
The 5 largest of its 56 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Exhaust Flow Modifier, Duct Intersection Incorporating the Same, and Methods Therefor | 5 in force | to Jan 2034 |
| High-Quality Coke Products | 4 in force | to May 2041 |
| Automatic Draft Control System for Coke Plants | 4 in force | to Nov 2034 |
| Coke Plant Including Exhaust Gas Sharing | 4 in force | to Jun 2034 |
| Foundry Coke Products, and Associated Systems, Devices, and Methods | 3 in force | to Nov 2042 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 8,152,970 | Method and Apparatus for Producing Coke In force · High confidence | In force | High confidence | |
| US 8,172,930 | Cleanable in Situ Spark Arrestor In force · High confidence | In force | High confidence | |
| US 10,611,965 | Coke Plant Including Exhaust Gas Sharing In force · Medium confidence | In force | Medium confidence | |
| US 10,947,455 | Automatic Draft Control System for Coke Plants In force · Medium confidence | In force | Medium confidence | |
| US 11,441,077 | Coke Plant Including Exhaust Gas Sharing In force · High confidence | In force | High confidence | |
| US 11,692,138 | Automatic Draft Control System for Coke Plants In force · Medium confidence | In force | Medium confidence | |
| US 12,195,671 | Automatic Draft Control System for Coke Plants In force · Medium confidence | In force | Medium confidence | |
| US 10,041,002 | Coke Plant Including Exhaust Gas Sharing In force · High confidence | In force | High confidence | |
| US 9,862,888 | Systems and Methods for Improving Quenched Coke Recovery In force · High confidence | In force | High confidence | |
| US 10,323,192 | Systems and Methods for Improving Quenched Coke Recovery In force · High confidence | In force | High confidence |
Also on record, not counted in the 103: 6 patents ended · 24 applications pending · 2 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.