Core Drilling Tools with External Fluid Pathways
US 8,869,918 Grace period endedTerm ends Jan 12, 2033 · Low confidence
20-year base term ends Oct 6, 2030
Grace period ended Oct 28, 2026 · no payment on record as of the Nov 10, 2026 fee file · lapse expected
Oct 6, 2010
Jan 12, 2033
Oct 28, 2014
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Oct 6, 2010, when the earliest non-provisional application in its chain was filed (this one was filed Dec 15, 2010) | Oct 6, 2030 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +829 days, USPTO patent term adjustment record | Jan 12, 2033 | 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 | The grace period ended with no payment on record in the fee file | grace period ended Oct 28, 2026 | Low confidence |
| Computed term end | The steps above, in order | Jan 12, 2033 | Low confidence |
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.
Not on this page: the patent's family, its recorded assignments and its citation count. USPTO's assignment records, linked above, list every recorded assignment.
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.