US3458041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic separation of dry materials
Assignee: Individual
•
Filing: 1968-06-25
•
Granted: 1969-07-29
•
Expires: 1988-06-25
Abstract
No abstract record available.
Inventors
- 👤 Byron C Schmid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:01
CPC Classifications
B; B03; B03C; B03C7/00; B03C7/02; B03C7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US234798A
Cited
US1043349A
Cited
GB191016287A
Cited
US993593A
Cited
US1744967A
Cited
US2577488A
Cited
US3087616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |