Term ends Dec 8, 2035 · High confidence
20-year base term ends Dec 8, 2035
Filed May 19, 2017 as application 15/528,153 · Granted May 1, 2018
Base term, 20 years from filing
Today
2015
2035
Clock starts
Dec 8, 2015
Dec 8, 2015
Term ends
Dec 8, 2035
Dec 8, 2035
Granted
May 1, 2018
May 1, 2018
base term
fee events
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.
2 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.
32
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 is its 20-year base term, with no adjustment for prosecution delay. 2 of 3 maintenance fees are 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 8, 2015, when application PCT/US2015/064432, the earliest non-provisional in its chain, was filed (this one was filed May 19, 2017) | Dec 8, 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 | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Dec 8, 2035 | High confidence |
This family
| Application PCT/US2014/071501 | PCT application no patent term | no patent term |
| Application PCT/US2015/064432 | PCT application no patent term | no patent term |
| US 10,351,536 | Lapsed on the fee record Jul 2023 | Jul 2023 |
| US 9,751,889 | In force Nov 2034 | Nov 2034 |
| US 9,969,701 | Lapsed on the fee record May 2026 | May 2026 |
| US 10,273,262 | Lapsed on the fee record Apr 2023 | Apr 2023 |
| US 9,957,240 | this patent Dec 2035 | Dec 2035 |
| US 10,246,437 | Lapsed on the fee record Apr 2023 | Apr 2023 |
8 of 32 applications in this family shown, earliest filings first. 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 |
|---|---|---|---|
| May 19, 2017 reel/frame not recorded | Li, Pixu; Wang, Peng; Chen, Minhua; Li, Jiaoyang; Yang, Chaohui; Zhang, Xiaoyu; Zhang, Yanfeng | Crystal Pharmatech Inc. | Assignment of Assignor's Interest |
| May 19, 2017 reel/frame not recorded | Li, Pixu; Wang, Peng; Chen, Minhua; Li, Jiaoyang; Yang, Chaohui; Zhang, Xiaoyu; Zhang, Yanfeng | Crystal Pharmatech Co., Ltd. | Assignment of Assignor's Interest |
| May 19, 2017 reel/frame not recorded | Li, Pixu; Wang, Peng; Chen, Minhua; Li, Jiaoyang; Yang, Chaohui; Zhang, Xiaoyu; Zhang, Yanfeng | Suzhou Pengxu Pharmatech Co., Ltd. | Assignment of Assignor's Interest |
| May 19, 2017 reel/frame not recorded | Suzhou Pengxu Pharmatech Co., Ltd.; Crystal Pharmatech Co., Ltd.; Crystal Pharmatech Inc. | Crystal Pharmatech Co., Ltd. | Assignment of Assignor's Interest |
| May 19, 2017 reel/frame not recorded | Suzhou Pengxu Pharmatech Co., Ltd.; Crystal Pharmatech Co., Ltd.; Crystal Pharmatech Inc. | Suzhou Pengxu Pharmatech Co., Ltd. | Assignment of Assignor's Interest |
| May 19, 2017 Reel 42434, frame 491 | Chen, Minhua; Zhang, Yanfeng; Yang, Chaohui; Zhang, Xiaoyu; Li, Jiaoyang; Wang, Peng; Li, Pixu | Crystal Pharmatech Inc.; Crystal Pharmatech Co., Ltd.; Suzhou Pengxu Pharmatech Co., Ltd. | Assignment of Assignor's Interest |
| May 19, 2017 Reel 42504, frame 464 | Crystal Pharmatech Inc.; Crystal Pharmatech Co., Ltd.; Suzhou Pengxu Pharmatech Co., Ltd. | Crystal Pharmatech Co., Ltd.; Suzhou Pengxu Pharmatech Co., Ltd. | 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.
What's changing
Dec 2035
Term ends Dec 8, 2035. Maintenance fees still fall due before then
Citations
1
later US patent cites this one
That is below the median of utility patents granted in 2018 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.