Methods for Inspecting Security Certificates by Network Security Devices to Detect and Prevent the Use of Invalid Certificates
US 8,850,576 Lapsed on the fee recordLapsed Sep 30, 2026 on the fee record · High confidence
20-year base term ends Jan 20, 2029
Third maintenance fee unpaid; grace period ended.
Jan 20, 2009
Sep 30, 2026
Sep 30, 2014
Jan 20, 2029
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Jan 20, 2009, when the earliest non-provisional application in its chain was filed (this one was filed Mar 4, 2012) | Jan 20, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | 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 Sep 30, 2026 | High confidence |
| Computed term end | The steps above, in order | Sep 30, 2026 | 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
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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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