Also listed on Sinopec Tech Houston, LLC., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Jan 27, 2040 · High confidence
20-year base term ends Mar 29, 2039
Filed Mar 29, 2019 as application 16/370,389 · Granted Sep 7, 2021
Base term plus 304 days of patent term adjustment (USPTO delay)
Today
2019
2040
Clock starts
Mar 29, 2019
Mar 29, 2019
Term ends
Jan 27, 2040
Jan 27, 2040
Granted
Sep 7, 2021
Sep 7, 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
304
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.
This patent's term runs 304 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 Mar 29, 2019, when this application, 16/370,389, was filed | Mar 29, 2039 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +304 days, USPTO patent term adjustment record | Jan 27, 2040 | 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 | Jan 27, 2040 | High confidence |
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 |
|---|---|---|---|
| Apr 9, 2019 Reel 48835, frame 464 | Sinopec Tech Houston, LLC. | China Petroleum & Chemical Corporation | Assignment of Assignor's Interest |
| Jun 4, 2019 reel/frame not recorded | Zhao, Jinhai; Han, Jun; Hu, Fengtao; Zhan, Sheng | China Petroleum & Chemical Corporation | Assignment of Assignor's Interest |
| Jun 4, 2019 reel/frame not recorded | Zhao, Jinhai; Han, Jun; Hu, Fengtao; Zhan, Sheng | Sinopec Tech Houston, LLC. | Assignment of Assignor's Interest |
| Jun 4, 2019 Reel 49365, frame 201 | Han, Jun; Zhan, Sheng; Hu, Fengtao; Zhao, Jinhai | China Petroleum & Chemical Corporation; Sinopec Tech Houston, LLC. | Assignment of Assignor's Interest |
| Jun 6, 2019 Reel 49408, frame 265 | Sinopec Tech Houston, LLC. | China Petroleum & Chemical Corporation | Corrective Assignment to Correct the Clerical Error Previously Recorded at Reel: 048835 Frame: 0464. Assignor(S) Hereby Confirms the Assignment. |
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
Jan 2040
Term ends Jan 27, 2040. Maintenance fees still fall due before then
Note
The 304 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.