Also listed on Paradyne Corporation, an earlier holder on the record. The recorded assignments below show how it moved.
Collateral for a security interest recorded Feb 10, 2022 (JPMorgan Chase Bank, N.A., as Administrative Assistant).
Term ends Dec 14, 2026 · High confidence
20-year base term ended Oct 1, 2024
Held by DZS Inc.
Filed Oct 1, 2004 as application 10/956,780 · Granted Apr 21, 2009
Base term plus 804 days of patent term adjustment (USPTO delay)
Today
2004
2026
Clock starts
Oct 1, 2004
Oct 1, 2004
Term ends
Dec 14, 2026
Dec 14, 2026
Granted
Apr 21, 2009
Apr 21, 2009
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
804
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.
3
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 804 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 Oct 1, 2004, when this application, 10/956,780, was filed | Oct 1, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +804 days, USPTO patent term adjustment record | Dec 14, 2026 | 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 | Dec 14, 2026 | High confidence |
This family
| US 7,522,679 | this patent Dec 2026 | Dec 2026 |
| US 7,835,459 | Term ended Oct 2024 | Oct 2024 |
| US 8,279,969 | Term ended Oct 2024 | Oct 2024 |
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 |
|---|---|---|---|
| Oct 1, 2004 Reel 15867, frame 440 | Betts, William L. | Paradyne Corporation | Assignment of Assignor's Interest |
| Apr 26, 2012 Reel 28115, frame 393 | Paradyne Corporation | Wells Fargo Bank, National Association | Patent and Trademark Security Agreement |
| Aug 10, 2018 Reel 46619, frame 225 | Paradyne Corporation | Wells Fargo Bank, National Association | Security Interest |
| Feb 28, 2019 Reel 48467, frame 326 | Dasan Network Solutions, Inc.; Premisys Communications, Inc.; Paradyne Networks, Inc.; Dasan Network Solutions, Inc. (Korea); Dasan Zhone Solutions, Inc.; Keymile GmbH; Paradyne Corporation | Pnc Bank, National Association | Security Interest |
| Feb 28, 2019 Reel 49983, frame 856 | Wells Fargo Bank, National Association | Paradyne Corporation | Release of Security Interest |
| Jun 4, 2020 Reel 52842, frame 504 | Pnc Bank, National Association | Dasan Zhone Solutions, Inc.; Premisys Communications, Inc.; Paradyne Networks, Inc.; Paradyne Corporation; Dasan Network Solutions, Inc.; Keymile GmbH; Dasan Network Solutions, Inc. | Release of Security Interest |
| Jun 4, 2020 reel/frame not recorded | Pnc Bank, National Association | Dasan Zhone Solutions, Inc. | Release of Security Interest |
| Jun 4, 2020 reel/frame not recorded | Pnc Bank, National Association | Premisys Communications, Inc. | Release of Security Interest |
| Jun 4, 2020 reel/frame not recorded | Pnc Bank, National Association | Paradyne Networks, Inc. | Release of Security Interest |
| Jun 4, 2020 reel/frame not recorded | Pnc Bank, National Association | Paradyne Corporation | Release of Security Interest |
| Jun 4, 2020 reel/frame not recorded | Pnc Bank, National Association | Dasan Network Solutions, Inc. | Release of Security Interest |
| Jun 4, 2020 reel/frame not recorded | Pnc Bank, National Association | Keymile GmbH | Release of Security Interest |
| Jun 4, 2020 reel/frame not recorded | Pnc Bank, National Association | Dasan Network Solutions, Inc. | Release of Security Interest |
| Jan 19, 2022 Reel 58692, frame 577 | Paradyne Corporation | DZS Inc. | Assignment of Assignor's Interest |
| Feb 10, 2022 Reel 58984, frame 564 | DZS Inc. | JPMorgan Chase Bank, N.A., as Administrative Assistant | Security 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Dec 2026
Term ends Dec 14, 2026. No further fees fall due before then
Note
The 804 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
6
later US patents cite this one
That is below the median of utility patents granted in 2009 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.