Composition and associated method for inhibiting stain formation on a ferrous metal surface
US 6,448,211 Lapsed on the fee recordLapsed Sep 10, 2010 on the fee record · From the USPTO record
20-year base term ended Sep 11, 2020
Second maintenance fee unpaid; grace period ended.
Sep 11, 2000
Sep 10, 2010
Sep 10, 2002
Feb 7, 2021
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Sep 11, 2000, when this application, 09/658,850, was filed | Sep 11, 2020 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +149 days, USPTO patent term adjustment record | Feb 7, 2021 | 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 Sep 10, 2010 | High confidence |
| Computed term end | The steps above, in order | Sep 10, 2010 | 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.