Integrated Stabilizer in Deisobutanizer for Isomerization of Hydrocarbons and Product Separation
US 11,306,047 Surrendered on reissueSurrendered on reissue Aug 4, 2026 · High confidence
20-year base term ends Apr 13, 2041
Surrendered on reissue Aug 4, 2026 · its term and maintenance fees continue in US RE50,978.
Apr 13, 2021
Aug 4, 2026
Apr 19, 2022
Apr 13, 2041
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Apr 13, 2021, when this application, 17/229,527, was filed | Apr 13, 2041 | 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 | 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 RE50,978 issued Aug 4, 2026, and this patent's term continues in it (35 U.S.C. 251, 252) | surrendered Aug 4, 2026 | High confidence |
| Surrendered on reissue | The steps above, in order | Aug 4, 2026 | High 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
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