Also listed on Boart Longyear Company, an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Feb 12, 2031 · High confidence
20-year base term ends Oct 6, 2030
Filed Oct 6, 2010 as application 12/898,878 · Granted Aug 5, 2014
Base term plus 652 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
2010
2031
Clock starts
Oct 6, 2010
Oct 6, 2010
Term ends
Feb 12, 2031
Feb 12, 2031
Granted
Aug 5, 2014
Aug 5, 2014
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
652
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 8,485,280.
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.
21
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 652 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 Oct 6, 2010, when this application, 12/898,878, was filed | Oct 6, 2030 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +652 days, USPTO patent term adjustment record | Jul 19, 2032 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,485,280) | capped to Feb 12, 2031 | 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 | Feb 12, 2031 | High confidence |
This family
| US 8,794,355 | this patent Feb 2031 | Feb 2031 |
| Application PCT/US2010/051747 | PCT application no patent term | no patent term |
| US 8,485,280 | In force Feb 2031 | Feb 2031 |
| US 8,869,918 | Grace period ended Jan 2033 | Jan 2033 |
| Application PCT/US2010/060744 | PCT application no patent term | no patent term |
| Application PCT/US2010/060742 | PCT application no patent term | no patent term |
| US D644,668 | Term ended Sep 2025 | Sep 2025 |
| US D643,443 | Term ended Aug 2025 | Aug 2025 |
8 of 21 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 |
|---|---|---|---|
| Oct 6, 2010 Reel 25099, frame 20 | Drenth, Christopher L.; Iondov, George; Ibrahim, George | Longyear TM, Inc. | Assignment of Assignor's Interest |
| Oct 7, 2010 Reel 25106, frame 897 | Drenth, Christopher L.; Iondov, George; Ibrahim, George | Longyear TM, Inc. | Assignment of Assignor's Interest |
| Jul 11, 2013 Reel 30775, frame 609 | Longyear TM, Inc. | Bank of America, N.A., as Agent | Notice of Grant of Security Interest in Patents |
| Sep 27, 2013 Reel 31306, frame 193 | Longyear TM, Inc. | U.S. Bank National Association, as Collateral Agent | Security Agreement |
| Oct 29, 2014 Reel 34084, frame 436 | Bank Of America, N.a. | Longyear TM, Inc. | Release of Security Interest Recorded at Reel/Frame 030775/0609 |
| Oct 29, 2014 Reel 34085, frame 704 | Longyear TM, Inc. | Wilmington Trust, N.a. | Security Interest (TERM Loan A) |
| Oct 29, 2014 Reel 34085, frame 775 | Longyear TM, Inc. | Wilmington Trust, N.a. | Security Interest (TERM Loan B) |
| Jul 13, 2016 Reel 39140, frame 16 | Longyear TM, Inc. | U.S. Bank National Association | Security Interest |
| Sep 8, 2017 Reel 43790, frame 390 | Longyear TM, Inc. | Wilmington Trust, National Association | Security Interest |
| Dec 31, 2018 Reel 47995, frame 550 | Longyear TM, Inc. | Wilmington Trust, National Association | Security Interest |
| Sep 8, 2021 Reel 57632, frame 481 | Longyear TM, Inc. | HPS Investment Partners, LLC | Security Interest |
| Sep 30, 2021 Reel 57687, frame 1 | Wilmington Trust, National Association, as Collateral Agent | Longyear TM, Inc. | Release of Security Interest |
| Sep 30, 2021 Reel 57878, frame 718 | U.S. Bank National Association, as Collateral Agent | Longyear TM, Inc. | Release of Security Interest |
| Nov 29, 2023 Reel 65708, frame 633 | Longyear TM, Inc. | Boart Longyear Company | Assignment of Assignor's Interest |
| Apr 11, 2024 Reel 67097, frame 641 | HPS Investment Partners, LLC | Longyear TM, Inc. | Release of Security Interest in Patents Recorded at R/F 057632/0481 |
| Apr 13, 2024 Reel 67342, frame 954 | Boart Longyear Company | Ally Bank, As Collateral Agent | Security Agreement |
| Mar 11, 2025 Reel 70480, frame 1 | Boart Longyear Company | Boart Longyear Manufacturing and Distribution Inc. | 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.
What's changing
Feb 2031
Term ends Feb 12, 2031. No further fees fall due before then
Note
The 652 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 8,485,280.
Citations
27
later US patents cite this one
That is top 25% of utility patents granted in 2014 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.