Systems and Methods for Secure and Certified Electronic Messaging
US 8,527,751 Lapsed on the fee recordLapsed Oct 6, 2025 on the fee record · Low confidence
20-year base term ended Aug 24, 2026
Maintenance fee unpaid; grace period ended.
Aug 24, 2006
Oct 6, 2025
Sep 3, 2013
Jan 16, 2028
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Aug 24, 2006, when the earliest non-provisional application in its chain was filed (this one was filed Jun 26, 2009); a parent in its chain could not be resolved (the next row) | Aug 24, 2026 | 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 | +510 days, USPTO patent term adjustment record | Jan 16, 2028 | 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 | 3 of 3 maintenance fees paid | lapsed Oct 6, 2025 | High confidence |
| Computed term end | The steps above, in order | Oct 6, 2025 | Low 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.