System for regulating flow of information to user by using time dependent function to adjust relevancy threshold
US 6,571,238 Lapsed on the fee recordLapsed May 27, 2015 on the fee record · From the USPTO record
20-year base term ended Jun 11, 2019
Third maintenance fee unpaid; grace period ended.
Jun 11, 1999
May 27, 2015
May 27, 2003
Jun 11, 2019
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Jun 11, 1999, when this application, 09/330,505, was filed | Jun 11, 2019 | 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 | 2 of 3 maintenance fees paid | lapsed May 27, 2015 | High confidence |
| Computed term end | The steps above, in order | May 27, 2015 | 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.