Vacuum excavation apparatus having an improved air lance, air lance nozzle, and vacuum system including a multistage venturi ejector
US RE38,872 Term endedTerm ended Mar 4, 2017 · From the USPTO record
20-year base term ended Mar 4, 2017
Reissue of US 06,000,151, which was surrendered when this reissue was granted; its term and maintenance fees continue here.
Mar 4, 1997
Mar 4, 2017
Nov 15, 2005
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Mar 4, 1997, when the earliest non-provisional application in its chain was filed (this one was filed Oct 31, 2001); a parent in its chain could not be resolved (the next row) | Mar 4, 2017 | High confidence |
| Continuity chain | A reissue: its term follows the original patent's, with the original's term adjustment; a parent in the chain could not be resolved | dated from this application's own claim | Low 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 | The reissue's fees post to its original, whose fee record is not available (likely before 2001) | term ended | Medium confidence |
| Computed term end | The steps above, in order | Mar 4, 2017 | 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
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.