US
Mass spectrometer for ultra-rapid scanning
US 4,171,482 Term endedTerm ended no later than Oct 16, 1999 · Low confidence
Granted Oct 16, 1979
How we calculated this date
One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Grant date | Read from the issue-week table: US utility patents issue in numbered batches on consecutive Tuesdays, so this number's issue date follows from the number itself | Oct 16, 1979 | High confidence |
| Statutory bound, 35 U.S.C. 154 | A patent term runs 17 years from grant or 20 years from filing, and either ends no later than 20 years from grant. The record gives no filing date to compute the exact term end from, so the date is a bound | no later than Oct 16, 1999 | Low confidence |
Sources
Google Patents · The patent document at USPTO · Assignment records at USPTO
USPTO account required: 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.