Patent US2085912A successfully refreshed from Google Patents.
Patent US3552028A successfully refreshed from Google Patents.
US3552028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring small deviations from a true horizontal plane
Assignee: Arthur D Little Inc
•
Filing: 1969-05-29
•
Granted: 1971-01-05
•
Expires: 1989-05-29
Abstract
Abstract AN APPARATUS ADAPTED CONTINUOUSLY TO MEASURE AND RECORD SMALL DEVIATIONS FROM A TRUE HORIZONTAL PLANE SUCH AS THOSE DEVIATIONS WHICH MAY OCCUR CONTINUOUSLY OR RECURRENTLY AS A RESULT OF GROUND MOTION AND THE LIKE. THE APPARATUS COMPRISES A DIAMAGNETIC BODY SUSPENDED IN A MAGNETIC FIELD OF A CONFIGURATION WHICH CONSTRAINS THE BODY RADIALLY BUT PERMITS IT TO MOVE AXIALLY WITHIN CERTAIN LIMITS. THE AMOUNT OF AXIAL MOVEMENT IS USED AS A MEASURE OF HORIZONTAL DEVIATION. THE SUSPENSION IS FRICTIONLESS, AND THE APPARATUS MAY BE MADE TO BE RELATIVELY RUGGED AND STABLE OVER EXTENDED PERIODS OF TIME. A ZEROREBLANCING SERVO SYSTEM IS PROVIDED.
Inventors
- 👤 Ivan Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:53
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |