Well liner segments for in situ petroleum upgrading and recovery, and method of in situ upgrading and recovery
US 7,909,097 Lapsed on the fee recordLapsed Mar 22, 2019 on the fee record · From the USPTO record
20-year base term ends Oct 17, 2028
Second maintenance fee unpaid; grace period ended.
Oct 17, 2008
Mar 22, 2019
Mar 22, 2011
Jan 25, 2029
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Oct 17, 2008, when this application, 12/285,980, was filed | Oct 17, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +100 days, USPTO patent term adjustment record | Jan 25, 2029 | 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 | lapsed Mar 22, 2019 | High confidence |
| Computed term end | The steps above, in order | Mar 22, 2019 | From the USPTO record |
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
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