Also listed on Guava Technologies, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Apr 12, 2032 · High confidence
20-year base term ends Apr 16, 2028
Held by Cytek Biosciences, Inc.
Filed Apr 16, 2008 as application 12/104,234 · Granted Feb 17, 2015
Base term plus 1457 days of patent term adjustment (USPTO delay)
Today
2008
2032
Clock starts
Apr 16, 2008
Apr 16, 2008
Term ends
Apr 12, 2032
Apr 12, 2032
Granted
Feb 17, 2015
Feb 17, 2015
base term
patent term adjustment
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
1,457
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 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 1457 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Apr 16, 2008, when this application, 12/104,234, was filed | Apr 16, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1457 days, USPTO patent term adjustment record | Apr 12, 2032 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Apr 12, 2032 | High confidence |
This family
| US 8,959,448 | this patent Apr 2032 | Apr 2032 |
| US 10,140,419 | In force Jul 2029 | Jul 2029 |
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 |
|---|---|---|---|
| Jul 8, 2008 Reel 21206, frame 250 | Cappione, Amedeo Joseph, III; Lefebvre, Ray; Kilcoin, Neil; King, David Andrew; Dixon, George J. | Guava Technologies, Inc. | Assignment of Assignor's Interest |
| Jul 23, 2010 Reel 24729, frame 396 | Guava Technologies, Inc. | Millipore Corporation | Merger |
| Jan 31, 2012 Reel 27620, frame 891 | Millipore Corporation | EMD Millipore Corporation | Change of Name |
| Feb 1, 2018 Reel 45225, frame 156 | EMD Millipore Corporation | EMD Millipore Corporation | Change of Address |
| Jun 6, 2019 Reel 49399, frame 1 | EMD Millipore Corporation | Luminex Corporation | Assignment of Assignor's Interest |
| Sep 27, 2023 Reel 65044, frame 762 | Luminex Corporation; Amnis, LLC; Iris Biotech Corporation | Cytek Biosciences, 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.
What's changing
Apr 2032
Term ends Apr 12, 2032. No further fees fall due before then
Note
The 1457 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
339
later US patents cite this one
That is top 1% of utility patents granted in 2015 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.