US3141333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depth measuring apparatus
Assignee: WR Grace and Co
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Filing: 1962-12-17
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Granted: 1964-07-21
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Expires: 1982-12-17
Abstract
No abstract record available.
Inventors
- 👤 David B Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:01
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/14; G01F23/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
IN ASSOCIATION WITH A TANK HAVING DIAPHRAGM-OPERATED MEANS TO INDICATE THE DEPTH OF LIQUID IN SAID TANK, MEANS TO PREVENT A COAGULABLE PRECIPITATE FROM SAID LIQUID FROM FORMING ON SAID DIAPHRAGM AND THEREBY IMPAIRING ITS ACCURACY WHICH INCLUDES A COLUMN OF LIQUID HAVING A DENSITY HIGHER THAN THAT OF THE CONTENTS OF SAID TANK, IN CONTACT WITH SAID DIAPHRAGM AND INTERPOSED BETWEEN SAID DIAPHRAGM AND THE LIQUID CONTENTS OF THE TANK, WHEREBY HEAD PRESSURE REPRESENTING THE HEIGHT OF LIQUID IN SAID TANK IS IMPOSED ON SAID HIGHER DENSITY LIQUID COLUMN, THE CONTACT OF THE COAGULUM WITH THE DIAPHRAGM IS PREVENTED.
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) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |