Term ends Dec 14, 2038 · High confidence
20-year base term ends Dec 29, 2037
Filed Dec 29, 2017 as application 15/857,949 · Granted Jul 21, 2020
Base term plus 350 days of patent term adjustment (USPTO delay)
Today
2017
2038
Clock starts
Dec 29, 2017
Dec 29, 2017
Term ends
Dec 14, 2038
Dec 14, 2038
Granted
Jul 21, 2020
Jul 21, 2020
base term
patent term adjustment
fee events
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
350
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
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.
4
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 350 days past its 20-year base term on prosecution delay. 1 of 3 maintenance fees is 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 Dec 29, 2017, when this application, 15/857,949, was filed | Dec 29, 2037 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +350 days, USPTO patent term adjustment record | Dec 14, 2038 | 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 | In force | High confidence |
| Computed term end | The steps above, in order | Dec 14, 2038 | High confidence |
This family
| US 10,720,626 | this patent Dec 2038 | Dec 2038 |
| US 11,509,022 | In force Dec 2037 | Dec 2037 |
| US 11,862,774 | In force Dec 2037 | Dec 2037 |
| Application 18/543,395 | Pending not computed | not computed |
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 |
|---|---|---|---|
| Jan 26, 2018 Reel 44743, frame 878 | Harris, W. Porter; Kawanishi, Kenneth; Greene, W. Hunter; Thibault, Robert Wesley; Gunasekaran, Arun | Romeo Systems, Inc. | Assignment of Assignor's Interest |
| Aug 19, 2020 Reel 53541, frame 961 | Romeo Systems, Inc. | Romeo Systems Technology, LLC | Assignment of Assignor's Interest |
| Sep 8, 2023 Reel 64849, frame 948 | SG Service Co., LLC, as Assignee for Romeo Power, Inc. | Mullen Automotive, Inc. | Assignment of Assignor's Interest |
| Jan 19, 2024 Reel 66178, frame 777 | Romeo Systems Technology, LLC; Romeo Systems, Inc.; Romeo Power, Inc. | SG Service Co., LLC, as Assignee for Romeo Power, Inc. | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Dec 2038
Term ends Dec 14, 2038. Maintenance fees still fall due before then
Note
The 350 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
46
later US patents cite this one
That is top 5% of utility patents granted in 2020 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.