Also listed on Mitel Knowledge Corporation, an earlier holder on the record. The recorded assignments below show how it moved.
Collateral for a security interest recorded Feb 14, 2023 (Bank of America, N.A.).
Term ends Nov 25, 2028 · High confidence
20-year base term ended Jan 23, 2021
Held by RingCentral, Inc.
Filed Jan 23, 2001 as application 09/768,129 · Granted Mar 9, 2010
Base term plus 2863 days of patent term adjustment (USPTO delay)
Today
2001
2028
Clock starts
Jan 23, 2001
Jan 23, 2001
Term ends
Nov 25, 2028
Nov 25, 2028
Granted
Mar 9, 2010
Mar 9, 2010
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
2,863
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.
This patent's term runs 2863 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 Jan 23, 2001, when this application, 09/768,129, was filed | Jan 23, 2021 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +2863 days, USPTO patent term adjustment record | Nov 25, 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 | Nov 25, 2028 | High confidence |
Assignments
The 40 most recent of 45 recorded documents are shown; the 5 earliest are not. 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 13, 2007 Reel 19817, frame 881 | Mitel Networks Corporation | Morgan Stanley & Co. Incorporated | Security Agreement |
| Oct 21, 2008 Reel 21794, frame 510 | Highbridge International LLC/Bny Trust Company of Canada | Mitel Networks Corporation | Release & Discharge of Security Interest |
| Apr 2, 2013 Reel 30165, frame 776 | Wilmington Trust, National Association FKA Wilmington Trust FSB/Morgan Stanley & Co. Incorporated | Mitel Networks Corporation | Release of Security Interest in Patents |
| Apr 8, 2013 Reel 30186, frame 894 | Mitel Networks Corporation | Bank of America, N.A., as Collateral Agent | Security Agreement |
| Apr 8, 2013 Reel 30201, frame 743 | Mitel Networks Corporation | Wilmington Trust, N.A., as Second Collateral Agent | Security Interest |
| Apr 15, 2013 Reel 30264, frame 470 | The Bank of New York Mellon; Morgan Stanley & Co. Incorporated; Morgan Stanley Senior Funding, Inc. | Mitel Networks Corporation | Release of Security Interest |
| Feb 6, 2014 Reel 32167, frame 464 | Wilmington Trust, National Association | Mitel Networks Corporation; Mitel US Holdings, Inc. | Release of Security Interest |
| Feb 6, 2014 reel/frame not recorded | Wilmington Trust, National Association | Mitel Networks Corporation | Release of Security Interest |
| Feb 6, 2014 reel/frame not recorded | Wilmington Trust, National Association | Mitel US Holdings, Inc. | Release of Security Interest |
| Feb 10, 2014 Reel 32210, frame 245 | Bank Of America, N.a. | Mitel Networks Corporation; Mitel US Holdings, Inc. | Release of Security Interest |
| Feb 10, 2014 reel/frame not recorded | Bank Of America, N.a. | Mitel Networks Corporation | Release of Security Interest |
| Feb 10, 2014 reel/frame not recorded | Bank Of America, N.a. | Mitel US Holdings, Inc. | Release of Security Interest |
| Feb 14, 2014 Reel 32264, frame 760 | Mitel US Holdings, Inc.; Mitel Networks Corporation; Aastra USA Inc. | Jefferies Finance LLC, as the Collateral Agent | Security Agreement |
| May 1, 2015 Reel 35562, frame 157 | Jefferies Finance LLC, as the Collateral Agent | Mitel US Holdings, Inc.; Mitel Networks Corporation; Mitel Communications Inc. FKA Aastra USA Inc. | Release of Security Interest |
| May 1, 2015 reel/frame not recorded | Jefferies Finance LLC, as the Collateral Agent | Mitel US Holdings, Inc. | Release of Security Interest |
| May 1, 2015 reel/frame not recorded | Jefferies Finance LLC, as the Collateral Agent | Mitel Networks Corporation | Release of Security Interest |
| May 1, 2015 reel/frame not recorded | Jefferies Finance LLC, as the Collateral Agent | Mitel Communications Inc. FKA Aastra USA Inc. | Release of Security Interest |
| May 28, 2015 Reel 35783, frame 540 | Mitel Networks Corporation | Bank of America, N.A.(Acting Through Its Canada Branch), as Canadian Collateral Agent | Security Interest |
| Mar 23, 2017 Reel 42107, frame 378 | Mitel Networks Corporation | Citizens Bank, N.a. | Security Interest |
| Mar 25, 2017 Reel 42244, frame 461 | Bank of America, N.A., as Collateral Agent; Bank of America, N.A., (Acting Through Its Canada Branch), as Canadian Collateral Agent | Mitel US Holdings, Inc.; Mitel Networks Corporation; Mitel (Delaware), Inc.; Mitel Networks, Inc.; Mitel Communications, Inc.; Mitel Business Systems, Inc. | Release of Security Interest |
| Mar 25, 2017 reel/frame not recorded | Bank of America, N.A., (Acting Through Its Canada Branch), as Canadian Collateral Agent; Bank of America, N.A., as Collateral Agent | Mitel US Holdings, Inc. | Release of Security Interest |
| Mar 25, 2017 reel/frame not recorded | Bank of America, N.A., (Acting Through Its Canada Branch), as Canadian Collateral Agent; Bank of America, N.A., as Collateral Agent | Mitel Networks Corporation | Release of Security Interest |
| Mar 25, 2017 reel/frame not recorded | Bank of America, N.A., (Acting Through Its Canada Branch), as Canadian Collateral Agent; Bank of America, N.A., as Collateral Agent | Mitel (Delaware), Inc. | Release of Security Interest |
| Mar 25, 2017 reel/frame not recorded | Bank of America, N.A., (Acting Through Its Canada Branch), as Canadian Collateral Agent; Bank of America, N.A., as Collateral Agent | Mitel Networks, Inc. | Release of Security Interest |
| Mar 25, 2017 reel/frame not recorded | Bank of America, N.A., (Acting Through Its Canada Branch), as Canadian Collateral Agent; Bank of America, N.A., as Collateral Agent | Mitel Communications, Inc. | Release of Security Interest |
| Mar 25, 2017 reel/frame not recorded | Bank of America, N.A., (Acting Through Its Canada Branch), as Canadian Collateral Agent; Bank of America, N.A., as Collateral Agent | Mitel Business Systems, Inc. | Release of Security Interest |
| Dec 3, 2018 Reel 48096, frame 785 | Citizens Bank, N.a. | Mitel Networks Corporation | Release of Security Interest |
| Dec 6, 2018 Reel 47694, frame 607 | MLN Acquisitionco ULC | Mitel Networks ULC | Change of Name |
| Dec 6, 2018 Reel 47694, frame 721 | Mitel Networks ULC | Mitel Cloud Services, Inc. | Assignment of Assignor's Interest |
| Dec 6, 2018 Reel 47734, frame 714 | Mitel Networks Corporation; MLN Acquisitionco ULC | MLN Acquisitionco ULC | Merger and Change of Name |
| Dec 13, 2018 Reel 47772, frame 355 | Mitel Cloud Services, Inc. | Credit Suisse AG, Cayman Islands Branch, as Collateral Agent | Security Interest |
| Jan 19, 2022 Reel 58698, frame 162 | Credit Suisse AG, Cayman Islands Branch, as Collateral Agent | Mitel Cloud Services, Inc. | Release of Security Interest |
| Feb 6, 2022 Reel 58900, frame 632 | Mitel Cloud Services, Inc. | RingCentral, Inc. | Assignment of Assignor's Interest |
| Feb 14, 2023 Reel 62973, frame 194 | RingCentral, Inc. | Bank of America, N.A., as Collateral Agent | Security Interest |
| Jun 24, 2025 Reel 71722, frame 721 | Ankura Trust Company, LLC | Mitel (Delaware), Inc.; Mitel Communications, Inc.; Mitel Cloud Services, Inc.; Mitel Networks, Inc.; Mitel Networks Corporation | Release of Security Interest |
| Jun 24, 2025 reel/frame not recorded | Ankura Trust Company, LLC | Mitel (Delaware), Inc. | Release of Security Interest |
| Jun 24, 2025 reel/frame not recorded | Ankura Trust Company, LLC | Mitel Communications, Inc. | Release of Security Interest |
| Jun 24, 2025 reel/frame not recorded | Ankura Trust Company, LLC | Mitel Cloud Services, Inc. | Release of Security Interest |
| Jun 24, 2025 reel/frame not recorded | Ankura Trust Company, LLC | Mitel Networks, Inc. | Release of Security Interest |
| Jun 24, 2025 reel/frame not recorded | Ankura Trust Company, LLC | Mitel Networks Corporation | 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
Nov 2028
Term ends Nov 25, 2028. No further fees fall due before then
Note
The 2863 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
7
later US patents cite this one
That is below the median of utility patents granted in 2010 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.