25 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.
5 more records may belong here and await a decision; they are not counted.
The next term ends in Apr 2030. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
2
Ending by 2030
Apr 2030
Next term end
7
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 2037 · High confidence
Also notable
Ends Sep 2033 · High confidence
Also notable
Ends Aug 2036 · High confidence
Coke Oven Corbel Structures
US 10,253,980
The most cited patent in this portfolio, cited by 10 later US patents, top 25% of utility patents granted in 2019 in our data. Protection runs to 2037.
Regenerator Wall Block
US D829,248
Granted 2018. Computed term ends 2033.
Coke Oven Corbel Gas Offtake Module Component
US D928,930
The newest of the three, granted 2021. It anchors the portfolio to 2036, later than anything else here.
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.
- 1 fee due Nov 21, 2026The maintenance fee for Methods and Apparatus for Constructing Glass Furnace Structures (US 10,294,085) comes due Nov 21, 2026. Unpaid by May 21, 2027, it lapses early.
- 1 fee due Dec 25, 2026The maintenance fee for Integral Self-Supporting Composite Refractory Wall Modules for Refractory Structures and Methods of Forming Refractory Structure Walls of the Same (US 10,330,315) comes due Dec 25, 2026. Unpaid by Jun 25, 2027, it lapses early.
- 2 fees due Jan 2 to 30, 2027 · next Jan 2
- 1 fee due Mar 10, 2027The maintenance fee for Methods and Apparatus for Constructing Glass Furnace Structures (US 10,407,333) comes due Mar 10, 2027. Unpaid by Sep 10, 2027, it lapses early.
Recent changes
Nothing was recorded against this company's patents in the last 90 days.
What they patent
The 5 largest of its 7 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Monolithic Rider Arch for Glass Furance Regenerator | 15 in force | to Nov 2037 |
| Coke Oven Corbel Gas Offtake Module | 3 in force | to Sep 2037 |
| Regenerator Wall Block | 3 in force | to Jul 2037 |
| Methods and Apparatus for Constructing Glass Furnace Refractory Structures | 1 in force | to Jul 2042 |
| Methods and Systems for Construction And/Or Repair of Coke Oven Walls | 1 in force | to May 2040 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US D753,740 | Monolithic Rider Arch for Glass Furance Regenerator In force · High confidence | In force | High confidence | |
| US D754,225 | Monolithic Crown Arch for Glass Furance Regenerator In force · High confidence | In force | High confidence | |
| US D829,248 | Regenerator Wall Block In force · High confidence | In force | High confidence | |
| US D833,590 | Coke Oven Wall Block Assembly In force · High confidence | In force | High confidence | |
| US D874,622 | Coke Oven Wall Block Assembly In force · Medium confidence | In force | Medium confidence | |
| US 9,963,372 | Monolithic Refractory Crown and Rider Arches for Glass Furnace Regenerators and Glass Furnace Regenerators Including the Same In force · High confidence | In force | High confidence | |
| US 11,180,350 | Methods and Apparatus for Constructing Glass Furnace Structures In force · High confidence | In force | High confidence | |
| US D916,153 | Regenerator Wall Block In force · High confidence | In force | High confidence | |
| US 10,065,391 | Integral Self-Supporting Composite Refractory Components and Methods of Making the Same In force · High confidence | In force | High confidence | |
| US D928,930 | Coke Oven Corbel Gas Offtake Module Component In force · High confidence | In force | High confidence |
Also on record, not counted in the 25: 1 patent in force now held by others · 3 patents ended · 4 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.