Lapsed Apr 17, 2026 on the fee record · High confidence
20-year base term ends Mar 15, 2033
Second maintenance fee unpaid; grace period ended.
Filed Feb 10, 2017 as application 15/429,412 · Granted Apr 17, 2018
Base term, 20 years from filing
Today
Lapsed Apr 17, 2026
2013
2033
Clock starts
Mar 15, 2013
Mar 15, 2013
No longer in force
Apr 17, 2026
Apr 17, 2026
Granted
Apr 17, 2018
Apr 17, 2018
Term would have run to
Mar 15, 2033
Mar 15, 2033
base term
after the term ends
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
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
1 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.
Its term would have run to Mar 15, 2033: its 20-year base term, with no adjustment for prosecution delay. 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 Mar 15, 2013, when application PCT/US2013/032218, the earliest non-provisional in its chain, was filed (this one was filed Feb 10, 2017) | Mar 15, 2033 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | 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 | 1 of 3 maintenance fees paid | lapsed Apr 17, 2026 | High confidence |
| Computed term end | The steps above, in order | Apr 17, 2026 | High confidence |
This family
| Application PCT/US2013/032218 | PCT application no patent term | no patent term |
| US 9,598,474 | In force Mar 2033 | Mar 2033 |
| US 9,944,681 | this patent Apr 2026 | Apr 2026 |
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 |
|---|---|---|---|
| Aug 23, 2017 Reel 43364, frame 853 | Berry, David Arthur; Boghigian, Brett Adam; Silver, Nathaniel W.; Von Maltzahn, Geoffrey; Chillakuru, Rajeev; Hamill, Michael J.; Kramarczyk, John F. | Pronutria, Inc. | Assignment of Assignor's Interest |
| Aug 23, 2017 Reel 43364, frame 861 | Pronutria, Inc. | Pronutria Biosciences, Inc., | Assignment of Assignor's Interest |
| Aug 23, 2017 Reel 43645, frame 302 | Pronutria Biosciences, Inc. | Axcella Health Inc. | Assignment of Assignor's Interest |
| Sep 2, 2021 Reel 57435, frame 136 | Axcella Health Inc. | SLR Investment Corp., as Agent | Intellectual Property Security Agreement |
| Dec 15, 2022 Reel 62137, frame 569 | SLR Investment Corp. | Axcella Health Inc. | Release of Security Interest |
| Dec 20, 2023 Reel 66125, frame 228 | Axcella Health Inc. | Axcella (Assignment for the Benefit of Creditors), LLC | Assignment of Assignor's 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.
Citations
1
later US patent cites this one
That is below the median of utility patents granted in 2018 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.