Term ends no later than Oct 28, 2028 · Medium confidence
20-year base term ends Oct 28, 2028
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 Briggs & Stratton, LLC
Filed Jan 27, 2011 as application 13/015,575 · Granted Aug 14, 2012
Base term, 20 years from filing
Today
2008
2028
Clock starts
Oct 28, 2008
Oct 28, 2008
Ends no later than
Oct 28, 2028
Oct 28, 2028
Granted
Aug 14, 2012
Aug 14, 2012
base term
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
None
Term adjustment
No prosecution delay on this record.
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.
13
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 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 28, 2008, when application 12/259,641, the earliest non-provisional in its chain, was filed (this one was filed Jan 27, 2011) | Oct 28, 2028 | 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 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 Oct 28, 2028 | Medium confidence |
This family
| US 8,403,102 | In force Jan 2032 | Jan 2032 |
| US 8,240,639 | In force Aug 2030 | Aug 2030 |
| US 8,517,146 | In force Jul 2031 | Jul 2031 |
| US 7,914,609 | In force Jul 2029 | Jul 2029 |
| US 8,065,823 | Lapsed on the fee record Nov 2019 | Nov 2019 |
| US 8,402,680 | Lapsed on the fee record Mar 2025 | Mar 2025 |
| US 8,241,378 | this patent no later than Oct 2028 | no later than Oct 2028 |
| US 9,433,147 | In force Feb 2034 | Feb 2034 |
8 of 13 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 |
|---|---|---|---|
| Sep 27, 2019 Reel 50564, frame 916 | Briggs & Stratton Corporation | JPMorgan Chase Bank, N.A., as Collateral Agent | Security Interest |
| Jul 22, 2020 Reel 53287, frame 487 | Briggs & Stratton Corporation | JPMorgan Chase Bank, N.A., as Collateral Agent | Security Interest |
| Aug 21, 2020 Reel 54617, frame 331 | JPMorgan Chase Bank, N.A., as Collateral Agent | Briggs & Stratton Corporation | Release of Security Interest |
| Sep 21, 2020 Reel 53838, frame 46 | Briggs & Stratton, LLC | Wells Fargo Bank, National Association, as Collateral Agent | Security Interest |
| Sep 22, 2020 Reel 53850, frame 192 | Briggs & Stratton, LLC | KPS Capital Finance Management, LLC | Security Interest |
| Sep 22, 2020 Reel 53885, frame 211 | JPMorgan Chase Bank, N.A., as Collateral Agent | Briggs & Stratton Corporation | Release of Security Interest |
| Jul 30, 2021 Reel 57042, frame 247 | Briggs & Stratton Corporation | Briggs & Stratton, LLC | Assignment of Assignor's 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
Oct 2028
Term ends no later than Oct 28, 2028. 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
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Oct 28, 2028. We will not guess the cap.
Citations
11
later US patents cite this one
That is above the median of utility patents granted in 2012 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.