US3474904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for the magnetic separation of fine parts
Assignee: AT&T Inc
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Filing: 1967-09-01
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Granted: 1969-10-28
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Expires: 1987-09-01
Abstract
No abstract record available.
Inventors
- 👤 Bernard G Casner
- 👤 Ray T Goulstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:04
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/035; B03C1/28; B03C1/288; B03C2201/00; B03C2201/18; Y; Y10; Y10S; Y10S209/00; Y10S209/906; Y10S209/908; Y10S209/933
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |