Also listed on Optical Solutions, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Jun 9, 2028 · High confidence
20-year base term ended May 28, 2024
Held by Calix, Inc.
Filed May 28, 2004 as application 10/857,349 · Granted Sep 8, 2009
Base term plus 1473 days of patent term adjustment (USPTO delay)
Today
2004
2028
Clock starts
May 28, 2004
May 28, 2004
Term ends
Jun 9, 2028
Jun 9, 2028
Granted
Sep 8, 2009
Sep 8, 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
1,473
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 1473 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 May 28, 2004, when this application, 10/857,349, was filed | May 28, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1473 days, USPTO patent term adjustment record | Jun 9, 2028 | 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 | Jun 9, 2028 | High confidence |
This family
| US 7,586,920 | this patent Jun 2028 | Jun 2028 |
| US 7,843,939 | Term ended Jun 2024 | Jun 2024 |
| US 8,559,440 | Term ended Apr 2025 | Apr 2025 |
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 |
|---|---|---|---|
| Sep 30, 2004 Reel 15837, frame 406 | Butler, Duane M.; Conner, Mike; Bernard, Christopher T.; Koch, Christopher D. | Optical Solutions, Inc. | Assignment of Assignor's Interest |
| Dec 10, 2004 Reel 16059, frame 161 | Optical Solutions, Inc. | Silicon Valley Bank | Security Interest |
| Aug 3, 2005 Reel 16345, frame 458 | Optical Solutions, Inc. | Partners For Growth, L.p. | Security Agreement |
| Feb 10, 2006 Reel 17145, frame 865 | Partners For Growth, L.p. | Optical Solutions, Inc. | Termination of Security Interest |
| Apr 17, 2006 Reel 17783, frame 365 | Silicon Valley Bank | Optical Solutions, Inc. | Release of Security Interest |
| Mar 9, 2007 Reel 19009, frame 826 | Optical Solutions, Inc. | Calix Networks, Inc. | Merger |
| May 14, 2007 Reel 19287, frame 59 | Calix Networks, Inc. | Greater Bay Venture Banking, a Division of Greater Bay Bank N.A. | Security Agreement |
| Jan 4, 2008 Reel 20317, frame 209 | Greater Bay Venture Banking, a Division of Greater Bay Bank N.A. | Calix Networks, Inc. | Release of Security Interest |
| Aug 11, 2008 Reel 21371, frame 500 | Calix Networks, Inc. | White Oak Global Advisors, LLC | Assignment of Assignor's Interest |
| Aug 29, 2008 Reel 21462, frame 12 | Calix Networks, Inc. | Silicon Valley Bank | Security Agreement |
| Nov 6, 2009 Reel 23471, frame 944 | White Oak Global Advisors, LLC | Calix Networks, Inc. | Release of Security Interest |
| May 14, 2010 Reel 24492, frame 841 | Calix Networks, Inc. | Calix, Inc. | Change of Name |
| Jul 29, 2013 Reel 30899, frame 597 | Calix, Inc. | Bank of America, N.A., as Administrative Agent | Security Agreement |
| Jul 30, 2013 Reel 30906, frame 224 | Silicon Valley Bank | Calix Networks, Inc. | Release of Security Interest |
| Aug 9, 2017 Reel 43495, frame 424 | Calix, Inc. | Silicon Valley Bank | Security Interest |
| Aug 9, 2017 Reel 43494, frame 549 | Bank of America, N.A., as Administrative Agent for Lenders | Calix, Inc. | Release of Security Interest |
| Jan 27, 2020 Reel 51714, frame 883 | Silicon Valley Bank | Calix, Inc. | Release of Security Interest in Intellectual Property |
| Jan 28, 2020 Reel 51719, frame 348 | Calix, Inc. | Bank of America, N.A., as Agent | Security Interest |
| Apr 18, 2022 Reel 59802, frame 579 | Bank Of America, N.a. | Calix, Inc. | Release of Security Interest |
| May 11, 2022 Reel 59929, frame 453 | Bank Of America, N.a. | Calix, Inc. | Release of 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
Jun 2028
Term ends Jun 9, 2028. No further fees fall due before then
Note
The 1473 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
3
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.