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US 7,878,307 Term endedTerm ended Oct 29, 2020 · Medium confidence
20-year base term ended Dec 21, 2019
Why Medium: A parent in the chain could not be resolved.
USPTO later recorded it as expired for non-payment on Mar 6, 2023.
Dec 21, 1999
Oct 29, 2020
Feb 1, 2011
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Dec 21, 1999, when the earliest non-provisional application in its chain was filed (this one was filed Oct 9, 2007); a parent in its chain could not be resolved (the next row) | Dec 21, 2019 | 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 | +628 days, USPTO patent term adjustment record | Sep 9, 2021 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 7,278,518) | capped to Oct 29, 2020 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | term ended | High confidence |
| USPTO status record | Recorded as expired for non-payment on Mar 6, 2023, after the term ended | no change | High confidence |
| Computed term end | The steps above, in order | Oct 29, 2020 | Medium 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.