Method for crystallizing amorphous silicon thin-film for use in thin-film transistors and thermal annealing apparatus therefor
US 6,689,647 Lapsed on the fee recordLapsed Feb 10, 2016 on the fee record · From the USPTO record
20-year base term ended Oct 16, 2018
Third maintenance fee unpaid; grace period ended.
Oct 16, 1998
Feb 10, 2016
Feb 10, 2004
May 10, 2019
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Oct 16, 1998, when the earliest non-provisional application in its chain was filed (this one was filed Jan 12, 2001) | Oct 16, 2018 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +206 days, USPTO patent term adjustment record | May 10, 2019 | High confidence |
| Terminal disclaimer cap | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | lapsed Feb 10, 2016 | High confidence |
| Computed term end | The steps above, in order | Feb 10, 2016 | 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
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