US2809731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic particle coupling device with nickel-coated iron particles
Assignee: Vickers Inc
•
Filing: 1950-11-16
•
Granted: 1957-10-15
•
Expires: 1970-11-16
Abstract
No abstract record available.
Inventors
- 👤 David W Rau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:45
CPC Classifications
F; F16; F16D; F16D37/00; F16D37/02; F16D2037/002
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US811654A
Cited
US1986197A
Cited
CH261748A
Cited
US2575360A
Cited
US2525571A
Cited
US2519449A
Cited
US2629471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |