2 patents currently held
15 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.
The next term ends in Mar 2031. from the record
Of the 15 now held by other companies, 15 name Vifor International Ltd. 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
Mar 2031
Next term end
1
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
Only 1 of the currently held patents qualifies as notable.
Formerly held, still cited
Notable
Ends Mar 2027 · High confidence
The most cited patent in this portfolio, cited by 30 later US patents, top 25% of utility patents granted in 2012 in our data. Protection runs to 2027.
now held by Vifor (International) Ltd.
Also notable
Ends May 2030 · High confidence
Cited by 27 later US patents, top 25% of utility patents granted in 2012 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2030.
now held by Vifor (International) Ltd.
Also notable
Ends Jun 2032 · High confidence
The largest patent family in this portfolio, 5 related applications, renewed at every maintenance window due so far. Protection runs to 2032.
now held by Vifor (International) Ltd.
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 May 10, 2027The maintenance fee for Crosslinked Polyvinylamine, Polyallylamine, and Polyethyleneimine for Use as Bile Acid Sequestrants (US 9,181,364) comes due May 10, 2027. Unpaid by Nov 10, 2027, it lapses early.
Recent changes
- 2 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.
Patents held now
Soonest term end first.
Showing 1 to 2 of 2
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 10,272,103 | Crosslinked Polyvinylamine, Polyallylamine, and Polyethyleneimine for Use as Bile Acid Sequestrants In force · High confidence | In force | High confidence | |
| US 9,181,364 | Crosslinked Polyvinylamine, Polyallylamine, and Polyethyleneimine for Use as Bile Acid Sequestrants In force · High confidence | In force | High confidence |
Also on record, not counted in the 2: 15 patents in force now held by others · 24 patents ended · 26 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.
2 terminal disclaimers are on file with no resolved reference. No cap is applied and none is guessed