Cassette Design Drop Out Box, Combustion Chamber, Duct and Electric Arc Furnace Upper Shell System
US 12,181,221 In forceTerm ends Mar 26, 2039 · High confidence
20-year base term ends Jun 13, 2038
Jun 13, 2018
Mar 26, 2039
Dec 31, 2024
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Jun 13, 2018, when the earliest non-provisional application in its chain was filed (this one was filed Jun 2, 2022) | Jun 13, 2038 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +286 days, USPTO patent term adjustment record | Mar 26, 2039 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 11,365,936) | resolves to Mar 26, 2039, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Mar 26, 2039 | 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
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.