Powdertech Co., Ltd.
7 more in force are now held by other companies
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
Recorded under 7 name spellings.
11
Ending by 2030
Nov 2026
Next term end
When these terms end
Held patents by the year their term ends
20262027202820292030203120322033203420352036203720382039204020412042204320442045
Fee deadlines
Maintenance fees fall due 3.5, 7.5 and 11.5 years after grant. A missed fee ends a patent at the end of the six month grace period that follows, not on the due date.
- 3 fees due Jun 1 to 10, 2027 · next Jun 1
- 1 fee due Jul 9, 2027The maintenance fee for Energy Storage Systems and Methods Using Heterogeneous Pressure Media and Interactive Actuation Module (US 11,870,253) comes due Jul 9, 2027. Unpaid by Jan 10, 2028, it lapses early.
- 1 fee due Aug 18, 2027The maintenance fee for Ferrite carrier core material for electrophotographic developer, ferrite carrier for electrophotographic developer, electrophotographic developer, and method for manufacturing ferrite carrier core material for electrophotographic developer (US 10,564,561) comes due Aug 18, 2027. Unpaid by Feb 18, 2028, it lapses early.
- 3 fees due Sep 10 to 30, 2027 · next Sep 10
- 1 fee due Oct 9, 2027The maintenance fee for Mn ferrite powder, resin composition, electromagnetic wave shielding material, electronic material, and electronic component (US 11,952,286) comes due Oct 9, 2027. Unpaid by Apr 10, 2028, it lapses early.
- 1 fee due Nov 3, 2027The maintenance fee for Resin-coated carrier for electrophotographic developer and electrophotographic developer using the resin-coated carrier (US 9,329,515) comes due Nov 3, 2027. Unpaid by May 3, 2028, it lapses early.
Recent changes
- 1 of the patents on this record was granted since Aug 16, 2026
Patents held now
Soonest term end first. Each date below is computed on that patent's own page, which shows the rule, the adjustments and the fee history it was derived from.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,824,833 | Resin-coated ferrite carrier for electrophotographic developer, its production method, and electrophotographic developer using the resin-coated ferrite carrier In force · From the USPTO record | In force | From the USPTO record | |
| US 7,521,163 | Resin-coated ferrite carrier for electrophotographic developer, its production method, and electrophotographic developer using the resin-coated ferrite carrier In force · From the USPTO record | In force | From the USPTO record | |
| US 7,566,519 | Carrier for electrophotographic developer, and electrophotographic developer using the same In force · From the USPTO record | In force | From the USPTO record | |
| US 7,862,975 | Carrier Core Material for an Electrophotographic Developer, Carrier, and Electrophotographic Developer Using the Carrier In force · Medium confidence | In force | Medium confidence | |
| US 7,897,317 | Method for producing core material of electrophotographic ferrite carrier and resin-coated ferrite carrier In force · From the USPTO record | In force | From the USPTO record | |
| US 8,168,364 | Resin-filled carrier for electrophotographic developer, and electrophotographic developer using the resin-filled carrier In force · From the USPTO record | In force | From the USPTO record | |
| US 7,906,265 | Ferrite carrier for electrophotographic developer, method for producing the same, and electrophotographic developer In force · From the USPTO record | In force | From the USPTO record | |
| US 7,964,330 | Electrophotographic resin-coated ferrite carrier, method for producing the same, and electrophotographic developer In force · From the USPTO record | In force | From the USPTO record | |
| US 8,039,190 | Carrier Core Material for Electrophotographic Developer, Carrier, and Electrophotographic Developer Using the Carrier In force · High confidence | In force | High confidence | |
| US 8,247,148 | Resin-coated ferrite carrier for electrophotographic developer and electrophotographic developer using the resin-coated ferrite carrier In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 70: 7 patents in force now held by others · 17 lapsed for an unpaid fee · 26 ended at full term. List them
Sources and methods
Compiled from the USPTO record, grants, published applications and recorded assignments, not yet reviewed by hand.
How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.
Published applications
US patent applications published under this name that have not become patents. An application is published about eighteen months after its earliest filing; one that has not been published is in no public record.
12 pending · 2 abandoned · 32 no status recorded