Method for Evaluating and Monitoring Formation Fracture Treatment Closure Rates and Pressures Using Fluid Pressure Waves
US 10,995,609 Surrendered on reissueSurrendered on reissue Sep 2, 2025 · Medium confidence
20-year base term ends Aug 18, 2037
Why Medium: A parent in the chain could not be resolved.
Surrendered on reissue Sep 2, 2025 · its term and maintenance fees continue in US RE50,568.
Aug 18, 2017
Sep 2, 2025
May 4, 2021
Dec 9, 2037
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Aug 18, 2017, when the earliest non-provisional application in its chain was filed (this one was filed May 1, 2018); a parent in its chain could not be resolved (the next row) | Aug 18, 2037 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium confidence |
| Patent term adjustment | +113 days, USPTO patent term adjustment record | Dec 9, 2037 | 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 | 1 of 3 maintenance fees paid | no change | High confidence |
| Reissue | US RE50,568 issued Sep 2, 2025, and this patent's term continues in it (35 U.S.C. 251, 252) | surrendered Sep 2, 2025 | High confidence |
| Surrendered on reissue | The steps above, in order | Sep 2, 2025 | Medium 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.