Term ended no later than May 8, 2023 · Medium confidence
20-year base term ended Feb 26, 2023
USPTO later recorded it as expired for non-payment on Nov 3, 2025.
Held by Ciena Corporation
Filed Mar 29, 2010 as application 12/798,157 · Granted Oct 1, 2013
Base term plus 71 days of patent term adjustment (USPTO delay)
Today
Ended no later than May 8, 2023
2003
2026
Clock starts
Feb 26, 2003
Feb 26, 2003
Ended no later than
May 8, 2023
May 8, 2023
Granted
Oct 1, 2013
Oct 1, 2013
base term
patent term adjustment
after the term ends
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
71
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
2 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.
5
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 71 days past its 20-year base term on prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. Confidence: Medium. 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 Feb 26, 2003, when application 10/374,882, the earliest non-provisional in its chain, was filed (this one was filed Mar 29, 2010) | Feb 26, 2023 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +71 days, USPTO patent term adjustment record | May 8, 2023 | High confidence |
| Terminal disclaimer cap | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | term ended | High confidence |
| USPTO status record | Recorded as expired for non-payment on Nov 3, 2025, after the term ended | no change | High confidence |
| Computed term end | The steps above, in order | no later than May 8, 2023 | Medium confidence |
This family
| US 7,277,393 | Term ended Mar 2026 | Mar 2026 |
| US 7,688,740 | Lapsed on the fee record Mar 2022 | Mar 2022 |
| US 9,026,674 | In force Nov 2030 | Nov 2030 |
| US 8,547,851 | this patent no later than May 2023 | no later than May 2023 |
| Application 14/703,305 | Abandoned not computed | not computed |
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 6, 2010 Reel 24663, frame 992 | Jacobson, Van; Yu, Haobo | Packet Design, Inc. | Assignment of Assignor's Interest |
| Dec 27, 2010 Reel 25617, frame 313 | Jacobson, Van; Yu, Haobo | Packet Design, Inc. | Assignment of Assignor's Interest |
| Mar 26, 2013 Reel 30089, frame 810 | Packet Design, Inc. | PD Acquisition, LLC | Assignment of Assignor's Interest |
| Mar 26, 2013 Reel 30091, frame 880 | PD Acquisition, LLC | Packet Design, LLC | Change of Name |
| Sep 10, 2014 Reel 33713, frame 276 | Packet Design, LLC | Comerica Bank | Security Interest |
| Jul 2, 2018 Reel 46464, frame 226 | Comerica Bank | Packet Design, LLC | Release of Security Interest at Reel 033713 / Frame 0276 |
| Jul 13, 2018 Reel 46342, frame 761 | Packet Design, LLC | Ciena Corporation | Merger |
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
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 71 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than May 8, 2023. We will not guess the cap.
Citations
4
later US patents cite this one
That is below the median of utility patents granted in 2013 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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. Related patents and pending applications may cover overlapping subject matter.