Two patents currently held, every record listed here
4 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.
1 more record may belong here and awaits a decision; it is not counted.
The next term ends in Aug 2040. from the record
Of the 4 now held by other companies, 4 name Chervon HK Limited as their current owner. Each row says so.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
0
Ending by 2030
Aug 2040
Next term end
1
Patent families
When these terms end
Each bar runs from grant to computed term end. 2012 to 2040.20182024203020362040
Every computed term in this portfolio is shown above.Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
Notable patents
Ranked by citations and family size, against patents of the same kind granted the same year. How we rank
Only 1 of the currently held patents qualifies as notable.
Formerly held, still cited
Notable
Ends Jul 2031 · High confidence
Renewed at every maintenance window since the 2014 grant; no more fees are due before its term ends in 2031.
now held by Chervon (HK) Limited
Also notable
Ends Jun 2030 · High confidence
Renewed at every maintenance window since the 2013 grant; no more fees are due before its term ends in 2030.
now held by Chervon (HK) Limited
Fee deadlines
No maintenance fee falls due on this company's record before Nov 10, 2027.
Recent changes
- 2 terms have ended since Aug 17, 2026
What they patent
Grouped by real patent family, largest first, labeled by the earliest filing in each. No technology classification is inferred from titles.
| Catalyst Supports and Catalyst Systems and Methods | 2 in force | to Sep 2040 |
Patents held now
Soonest term end first.
Showing 1 to 2 of 2
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 11,577,230 | Catalyst Supports and Catalyst Systems and Methods In force · High confidence | In force | High confidence | |
| US 11,529,617 | Catalyst Supports and Catalyst Systems and Methods In force · High confidence | In force | High confidence |
Also on record, not counted in the 2: 4 patents in force now held by others · 61 patents ended · 43 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.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.
4 patents carry no fee events. That is a gap in the record, not evidence of lapse, so status falls back to the computed term
3 terminal disclaimers are on file with no resolved reference. No cap is applied and none is guessed