Term ends Mar 27, 2039 · High confidence
20-year base term ends Nov 17, 2037
Filed Nov 17, 2017 as application 15/815,975 · Granted May 4, 2021
Base term plus 495 days of patent term adjustment (USPTO delay)
Today
2017
2039
Clock starts
Nov 17, 2017
Nov 17, 2017
Term ends
Mar 27, 2039
Mar 27, 2039
Granted
May 4, 2021
May 4, 2021
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
495
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.
2
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 495 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 Nov 17, 2017, when this application, 15/815,975, was filed | Nov 17, 2037 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +495 days, USPTO patent term adjustment record | Mar 27, 2039 | 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 | Mar 27, 2039 | High confidence |
This family
| US 10,998,590 | this patent Mar 2039 | Mar 2039 |
| US 11,677,109 | In force no later than Mar 2038 | no later than Mar 2038 |
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 |
|---|---|---|---|
| Nov 17, 2017 Reel 44159, frame 797 | Harris, W. Porter; Wang, Qian; Vite, Berton; Greene, W. Hunter | 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
Mar 2039
Term ends Mar 27, 2039. Maintenance fees still fall due before then
Note
The 495 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
37
later US patents cite this one
That is top 5% of utility patents granted in 2021 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.