Lapsed Sep 17, 2023 on the fee record · High confidence
20-year base term ends Mar 11, 2035
First maintenance fee unpaid; grace period ended.
Held by Grace Engineering Corp.
Filed Feb 9, 2018 as application 15/893,137 · Granted Sep 17, 2019
Base term, 20 years from filing
Today
Lapsed Sep 17, 2023
2015
2035
Clock starts
Mar 11, 2015
Mar 11, 2015
No longer in force
Sep 17, 2023
Sep 17, 2023
Granted
Sep 17, 2019
Sep 17, 2019
Term would have run to
Mar 11, 2035
Mar 11, 2035
base term
after the term ends
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.
0 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.
6
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 11, 2035: 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 11, 2015, when application 14/644,718, the earliest non-provisional in its chain, was filed (this one was filed Feb 9, 2018) | Mar 11, 2035 | 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 | 0 of 3 maintenance fees paid | lapsed Sep 17, 2023 | High confidence |
| Computed term end | The steps above, in order | Sep 17, 2023 | High confidence |
This family
| US 9,528,796 | In force Mar 2035 | Mar 2035 |
| US 10,094,638 | In force Mar 2035 | Mar 2035 |
| US 10,302,393 | Lapsed on the fee record May 2023 | May 2023 |
| US 10,415,931 | this patent Sep 2023 | Sep 2023 |
| US 10,648,770 | In force Mar 2035 | Mar 2035 |
| Application 16/389,126 | Abandoned 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 |
|---|---|---|---|
| Feb 14, 2018 Reel 44927, frame 804 | Grace, Louis, JR. | Grace Engineering Corp. | 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.
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Alerts on its grants, lapses and transfers.
Citations
7
later US patents cite this one
That is above the median of utility patents granted in 2019 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.