One patent currently held, every record listed here
8 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 Jun 2031. from the record
Of the 8 now held by other companies, 6 name Evonik Operations GmbH as their current owner, and 2 more name another party. Each row says which.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
0
Ending by 2030
Jun 2031
Next term end
1
Patent families
When these terms end
Each bar runs from grant to computed term end. 2011 to 2041.20172023202920352041
Every computed term in this portfolio is shown above.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 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 Jun 2041 · High confidence
Cited by 5 later US patents, top 25% of utility patents granted in 2023 in our data. Protection runs to 2041.
now held by Evonik Operations GmbH
Also notable
Ends Sep 2033 · High confidence
A family of 22 related applications built on the 2020 grant. Protection runs to 2033. A terminal disclaimer caps this term to an earlier patent's.
now held by Evonik Operations GmbH
Fee deadlines
No maintenance fee falls due on this company's record before Nov 10, 2027.
Recent changes
- 4 terms have ended since Aug 16, 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.
| Synergy of Strong Acids and Peroxy Compounds | 1 in force | to Jun 2031 |
Patents held now
Soonest term end first.
Showing 1 to 1 of 1
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 9,005,669 | Synergy of Strong Acids and Peroxy Compounds In force · Medium confidence | In force | Medium confidence |
Also on record, not counted in the 1: 8 patents in force now held by others · 30 patents ended · 18 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.
2 terminal disclaimers are on file with no resolved reference. No cap is applied and none is guessed
4 computed term dates come from a chain with an unresolved parent. A continuity parent has not yet been fetched from USPTO's records. The term is dated from this application's own claim; no earlier date is assumed until the parent is resolved.