Disk storage system having an electronic circuit mounted on the surface of the disk and control method thereof
US 6,938,121 Lapsed on the fee recordLapsed Aug 30, 2013 on the fee record · From the USPTO record
20-year base term ended Oct 2, 2018
Second maintenance fee unpaid; grace period ended.
Oct 2, 1998
Aug 30, 2013
Aug 30, 2005
Oct 2, 2018
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Oct 2, 1998, when the earliest non-provisional application in its chain was filed (this one was filed Apr 6, 2004); a parent in its chain could not be resolved (the next row) | Oct 2, 2018 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium 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 | lapsed Aug 30, 2013 | High confidence |
| Computed term end | The steps above, in order | Aug 30, 2013 | 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.