US3389321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency sensing detector for stopping a motor upon slowdown
Assignee: CalPortland Co
•
Filing: 1965-04-27
•
Granted: 1968-06-18
•
Expires: 1985-04-27
Abstract
No abstract record available.
Inventors
- 👤 Robert D Miller
- 👤 Ronald E Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:21
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/093
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |