Collateral for a security interest recorded Jan 4, 2019 (Mintz Levin Cohn Ferris Glovsky and Popeo, P.C.).
Term ended Oct 24, 2025 · Medium confidence
20-year base term ended Oct 24, 2025
Why Medium: The disclaimer's references carry disclaimers of their own not yet read (US 8,280,321), so the cap could be lower.
Held by Parkervision, Inc.
Filed Aug 30, 2006 as application 11/512,146 · Granted Apr 23, 2013
Base term, 20 years from filing
Today
Term ended Oct 24, 2025
2005
2026
Clock starts
Oct 24, 2005
Oct 24, 2005
Term ended
Oct 24, 2025
Oct 24, 2025
Granted
Apr 23, 2013
Apr 23, 2013
base term
after the term ends
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
None
Term adjustment
No prosecution delay on this record.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 8,280,321, to Oct 24, 2025. The term already ends on or before that date, so the cap shortened nothing.
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.
19
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 is its 20-year base term, with no adjustment for prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. All three maintenance fees were paid, so no fee lapse ended it. 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 Oct 24, 2005, when application 11/256,172, the earliest non-provisional in its chain, was filed (this one was filed Aug 30, 2006) | Oct 24, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,280,321) | resolves to Oct 24, 2025, no earlier than this term, so no change | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 3 of 3 maintenance fees paid | term ended | High confidence |
| Computed term end | The steps above, in order | Oct 24, 2025 | Medium confidence |
This family
| US 7,184,723 | Lapsed on the fee record Feb 2019 | Feb 2019 |
| US 7,835,709 | Lapsed on the fee record Nov 2022 | Nov 2022 |
| US 7,945,224 | Lapsed on the fee record May 2023 | May 2023 |
| US 7,355,470 | Lapsed on the fee record Apr 2020 | Apr 2020 |
| US 8,428,527 | this patent Oct 2025 | Oct 2025 |
| US 8,406,711 | In force no later than Nov 2026 | no later than Nov 2026 |
| US 7,526,261 | Term ended Apr 2026 | Apr 2026 |
| US 8,351,870 | In force no later than Apr 2027 | no later than Apr 2027 |
8 of 19 applications in this family shown, earliest filings first. 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 |
|---|---|---|---|
| Aug 30, 2006 Reel 18255, frame 134 | Sorrells, David F.; Rawlins, Gregory S.; Rawlins, Michael W. | Parkervision, Inc. | Assignment of Assignor's Interest |
| Jan 4, 2019 Reel 47905, frame 316 | Parkervision Inc. | Mintz Levin Cohn Ferris Glovsky and Popeo, P.C. | 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.
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 8,280,321, ends no earlier than this term, so it caps nothing.
Citations
83
later US patents cite this one
That is top 10% 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
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.