Optical Head Device That Prevents the Displacement of the Optical Axis Caused by Expansion or Contraction Due to Temperature Change
US 7,414,926 Lapsed on the fee recordLapsed Aug 19, 2020 on the fee record · High confidence
20-year base term ended Dec 19, 2023
Third maintenance fee unpaid; grace period ended.
Dec 19, 2003
Aug 19, 2020
Aug 19, 2008
Jun 10, 2025
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Dec 19, 2003, when this application, 10/742,370, was filed | Dec 19, 2023 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +539 days, USPTO patent term adjustment record | Jun 10, 2025 | 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 | 2 of 3 maintenance fees paid | lapsed Aug 19, 2020 | High confidence |
| Computed term end | The steps above, in order | Aug 19, 2020 | High 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
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