USRE27899E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slope sensing device
Assignee: —
•
Filing: 1973-02-12
•
Granted: 1974-01-22
•
Expires: 1993-02-12
Abstract
Abstract A BODY OF MERCURY, THE MOVEMENT OF WHICH IS DAMPENED BY BAFFLES, ESTABLISHES A CONDUCTIVE PATH BETWEEN CONTACTS WITHIN A CHAMBER THE POSITION OF WHICH REFLECTS TILTING OF A GRADING BLADE (OF) TO AUTOMATICALLY CORRECT THE POSITION OF THE BLADE. THE SENSITIVITY OF THE DEVICE IS VARIED BY ADJUSTING THE POSITION OF AN ELEMENT PARTIALLY SUBMERGED IN THE MERCURY.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:33
CPC Classifications
H; H01; H01H; H01H29/00; H01H29/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |