Use of Acrylic Polymers Neutralized by Lithium as Dispersing Agents or Grinding Aid Agents of Mineral Materials in an Aqueous Medium
US 8,785,536 Lapsed on the fee recordLapsed Jul 22, 2026 on the fee record · High confidence
20-year base term ends Dec 8, 2029
Third maintenance fee unpaid; grace period ended.
Dec 8, 2009
Jul 22, 2026
Jul 22, 2014
Mar 29, 2030
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Dec 8, 2009, when the earliest non-provisional application in its chain was filed (this one was filed Jul 19, 2011) | Dec 8, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +111 days, USPTO patent term adjustment record | Mar 29, 2030 | 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 Jul 22, 2026 | High confidence |
| Computed term end | The steps above, in order | Jul 22, 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
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.