Lapsed Oct 5, 2025 on the fee record · High confidence
20-year base term ends Jan 4, 2036
First maintenance fee unpaid; grace period ended.
Held by HPC Petroserve, Inc.
Filed Dec 19, 2018 as application 16/225,816 · Granted Oct 5, 2021
Base term, 20 years from filing, plus 14 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
Lapsed Oct 5, 2025
2016
2036
Clock starts
Jan 4, 2016
Jan 4, 2016
No longer in force
Oct 5, 2025
Oct 5, 2025
Granted
Oct 5, 2021
Oct 5, 2021
Term would have run to
Jan 4, 2036
Jan 4, 2036
base term
after the term ends
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
14
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 10,179,881.
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.
2
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 Jan 4, 2036: its 20-year base term plus 14 days of term adjustment for prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 Jan 4, 2016, when application 14/987,522, the earliest non-provisional in its chain, was filed (this one was filed Dec 19, 2018) | Jan 4, 2036 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +14 days, USPTO patent term adjustment record | Jan 18, 2036 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 10,179,881) | capped to Jan 4, 2036 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 3 maintenance fees paid | lapsed Oct 5, 2025 | High confidence |
| Computed term end | The steps above, in order | Oct 5, 2025 | High confidence |
This family
| US 10,179,881 | In force Jan 2036 | Jan 2036 |
| US 11,136,510 | this patent Oct 2025 | Oct 2025 |
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 9, 2019 Reel 47945, frame 937 | Matza, Stephen D. | Tristar Petroserv, Inc. | Assignment of Assignor's Interest |
| Mar 11, 2020 Reel 52148, frame 400 | HPC Petroserv, Inc.; Global Vapor Control, Inc. | Goldman Sachs Bank USA | Security Agreement |
| May 22, 2020 Reel 52730, frame 729 | HPC Petroserv, Inc.; Global Vapor Control, Inc. | Goldman Sachs Bank USA, as Collateral Agent | Security Interest |
| Jan 26, 2021 Reel 55029, frame 80 | Tristar Petroserv, Inc. | HPC Petroserv, Inc. | Assignment of Assignor's Interest |
| Oct 8, 2021 Reel 57899, frame 694 | Aquilex LLC; Global Vapor Control, Inc.; Hydrochem LLC; HPC Petroserv, Inc.; PCS Industrial Outsourcing, LP | Goldman Sachs Lending Partners LLC | Security Agreement |
| Oct 11, 2021 reel/frame not recorded | Goldman Sachs Bank USA | Global Vapor Control, Inc. | Abl Release (REEL 052148 / Frame 0400) |
| Oct 11, 2021 reel/frame not recorded | Goldman Sachs Bank USA | HPC Petroserv, Inc. | Abl Release (REEL 052148 / Frame 0400) |
| Oct 11, 2021 reel/frame not recorded | Goldman Sachs Bank USA | Global Vapor Control, Inc. | First Lien Release (REEL 052730 / Frame 0719) |
| Oct 11, 2021 reel/frame not recorded | Goldman Sachs Bank USA | HPC Petroserv, Inc. | First Lien Release (REEL 052730 / Frame 0719) |
| Oct 11, 2021 reel/frame not recorded | Goldman Sachs Bank USA | Global Vapor Control, Inc. | Second Lien Release (REEL 052730 / Frame 0729) |
| Oct 11, 2021 reel/frame not recorded | Goldman Sachs Bank USA | HPC Petroserv, Inc. | Second Lien Release (REEL 052730 / Frame 0729) |
| Oct 11, 2021 Reel 57772, frame 603 | Goldman Sachs Bank USA | Global Vapor Control, Inc.; HPC Petroserv, Inc. | Abl Release (REEL 052148 / Frame 0400) |
| Oct 11, 2021 Reel 57772, frame 628 | Goldman Sachs Bank USA | Global Vapor Control, Inc.; HPC Petroserv, Inc. | First Lien Release (REEL 052730 / Frame 0719) |
| Oct 11, 2021 Reel 57772, frame 643 | Goldman Sachs Bank USA | Global Vapor Control, Inc.; HPC Petroserv, Inc. | Second Lien Release (REEL 052730 / Frame 0729) |
| Oct 12, 2021 Reel 57759, frame 688 | Aquilex LLC; Global Vapor Control, Inc.; Hydrochem LLC; HPC Petroserv, Inc.; PSC Industrial Outsourcing, LP | Bank Of America, N.a. | Security Interest |
| May 16, 2025 Reel 71297, frame 913 | Tristar Petroserv, Inc. | HPC Petroserve, Inc. | Change of Name |
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.
What's changing
Note
The 14 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 10,179,881.
Citations
1
later US patent cites this one
That is below the median 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.