Bonded aggregate composition and binders for the same
US 6,447,596 Surrendered on reissueSurrendered on reissue Jul 5, 2011 · From the USPTO record
20-year base term ended Apr 27, 2012
Surrendered on reissue Jul 5, 2011 · its term and maintenance fees continue in US RE42,511.
Apr 27, 1992
Jul 5, 2011
Sep 10, 2002
Apr 27, 2012
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Apr 27, 1992, when the earliest non-provisional application in its chain was filed (this one was filed May 1, 2000); a parent in its chain could not be resolved (the next row) | Apr 27, 2012 | 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 | None on file | no change | 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 2 maintenance fees paid | no change | High confidence |
| Reissue | US RE42,511 issued Jul 5, 2011, and this patent's term continues in it (35 U.S.C. 251, 252) | surrendered Jul 5, 2011 | High confidence |
| Surrendered on reissue | The steps above, in order | Jul 5, 2011 | 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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. Related patents and pending applications may cover overlapping subject matter.