Term ends Apr 15, 2031 · High confidence
20-year base term ends Feb 24, 2031
Held by Relypsa, Inc.
Filed Oct 11, 2012 as application 13/581,049 · Granted Nov 10, 2015
Base term plus 50 days of patent term adjustment (USPTO delay)
Today
2011
2031
Clock starts
Feb 24, 2011
Feb 24, 2011
Term ends
Apr 15, 2031
Apr 15, 2031
Granted
Nov 10, 2015
Nov 10, 2015
base term
patent term adjustment
fee events
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
50
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.
3
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
This patent's term runs 50 days past its 20-year base term on prosecution delay. 2 of 3 maintenance fees are paid so far. Confidence: High. from the record
How we calculated this date
One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Feb 24, 2011, when application PCT/US2011/026099, the earliest non-provisional in its chain, was filed (this one was filed Oct 11, 2012) | Feb 24, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +50 days, USPTO patent term adjustment record | Apr 15, 2031 | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Apr 15, 2031 | High confidence |
This family
| Application PCT/US2011/026099 | PCT application no patent term | no patent term |
| US 9,181,364 | this patent Apr 2031 | Apr 2031 |
| US 10,272,103 | In force Mar 2031 | Mar 2031 |
The applications whose file history this site holds. The family may have others.
Assignments
Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Sep 21, 2012 Reel 29002, frame 48 | Kopping, Jordan; Biyani, Kalpesh; Connor, Eric; Hecker, Scott; Lees, Inez; Quaker, Grace; Salaymeh, Faleh; Zhang, Hongmin; Bergbreiter, David; Mansky, Paul; Mu, Yongqi; Cope, Michael James; Goka, Elizabeth; Lee, Angela; Madsen, Deidre; Shao, Jun | Relypsa, Inc. | Assignment of Assignor's Interest |
| Apr 27, 2016 Reel 38394, frame 34 | Relypsa, Inc. | Cantor Fitzgerald Securities | Security Interest |
| Sep 2, 2016 Reel 39621, frame 142 | Cantor Fitzgerald Securities | Relypsa, Inc. | Release of Security Interest |
Sources
Google Patents · The patent document at USPTO · Assignment records at USPTO
USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup
Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Apr 2031
Term ends Apr 15, 2031. Maintenance fees still fall due before then
Note
The 50 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
16
later US patents cite this one
That is above the median of utility patents granted in 2015 in our data, the only group it is compared against.
How we rank
Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.