Collateral for a security interest recorded Jan 4, 2019 (Mintz Levin Cohn Ferris Glovsky and Popeo, P.C.).
Term ends no later than Apr 18, 2027 · Medium confidence
20-year base term ended Oct 24, 2025
In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.
Held by Parkervision, Inc.
Filed Nov 15, 2006 as application 11/599,390 · Granted Jan 8, 2013
USPTO first gave this application the number US 8,238,847 and withdrew it before it issued. That number now leads here.
Base term plus 541 days of patent term adjustment (USPTO delay)
Today
2005
2027
Clock starts
Oct 24, 2005
Oct 24, 2005
Ends no later than
Apr 18, 2027
Apr 18, 2027
Granted
Jan 8, 2013
Jan 8, 2013
base term
patent term adjustment
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
541
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.
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 runs 541 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. All three maintenance fees are recorded paid; no more fees are due. 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 Nov 15, 2006) | Oct 24, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +541 days, USPTO patent term adjustment record | Apr 18, 2027 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | no later than Apr 18, 2027 | 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 | Term ended 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 | this patent 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 |
|---|---|---|---|
| Nov 15, 2006 Reel 18611, frame 329 | Sorrells, David F.; Rawlings, 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.
What's changing
Apr 2027
Term ends no later than Apr 18, 2027. No further fees fall due before then
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 541 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 Apr 18, 2027. We will not guess the cap.
Citations
30
later US patents cite this one
That is top 25% 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.