US3290938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic displacement level indicator for storage bin
Assignee: Individual
•
Filing: 1965-05-13
•
Granted: 1966-12-13
•
Expires: 1985-05-13
Abstract
No abstract record available.
Inventors
- 👤 Ralph R Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:48
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/14; G01F23/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A DEVICE OPERATING AT SUBSTANTIALLY CONSTANT PRESSURE FOR MEASURING AND INDICATING THE LEVEL OF FLOWABLE GRANULAR OR FINELY DIVIDED SOLID MATERIAL IN A CONTAINER WHICH COMPRISES A READILY COLLAPSIBLE FLUID TIGHT TUBE ELEMENT ADAPTED FOR BEING PLACED IN THE CONTAINER SO AS TO EXTEND DOWNWARDLY THEREIN WHEREBY TO BE IMMERSED IN THE FLOWABLE MATERIAL IN THE CONTAINER; A FLUID TIGHT EXPANSIBLE ELEMENT OUTSIDE THE CONTAINER, AND VARIABLE IN VOLUME WITH SUBSTANTIALLY NO CHANGE IN PRESSURE THEREIN, TUBE MEANS CONNECTING THE SAID COLLAPSIBLE TUBE ELEMENT TO SAID EXPANSIBLE ELEMENT IN FLUID EXCHANGE RELATION TO FORM A CLOSED FLUID SYSTEM, MEANS FOR INDICATING THE CHANGE IN THE DEGREE OF EXPANSION OF SAID EXPANSIBLE ELEMENT AS BROUGHT ABOUT BY CHANGES IN THE DEGREE OF COLLAPSING OF SAID COLLAPSIBLE THE MATERIAL IN THE CONTAINER, AND MEANS FOR MAINTAINING A SUBSTANTIALLY CONSTANT PRESSURE IN SAID FLUID SYSTEM.
Claim 2
Independent Claim
142 words
A DEVICE OPERATING AT SUBSTANTIALLY CONSTANT PRESSURE FOR MEASURING AND INDICATING THE LEVEL OF FLOWABLE GRANULAR OR FINELY DIVIDED SOLID MATERIAL IN A CONTAINER WHICH COMPRISES A READILY COLLAPSIBLE FLUID TIGHT TUBE ELEMENT ADAPTED FOR BEING PLACED IN THE CONTAINER SO AS TO EXTEND DOWNWARDLY THEREIN WHEREBY TO BE IMMERSED IN THE FLOWABLE MATERIAL IN THE CONTAINER; A FLUID TIGHT EXPANSIBLE ELEMENT OUTSIDE THE CONTAINER, AND VARIABLE IN VOLUME WITH SUBSTANTIALLY NO CHANGE IN PRESSURE THEREIN, TUBE MEANS CONNECTING THE SAID COLLAPSIBLE TUBE ELEMENT TO SAID EXPANSIBLE ELEMENT IN FLUID EXCHANGE RELATION TO FORM A CLOSED FLUID SYSTEM, MEANS FOR INDICATING THE CHANGE IN THE DEGREE OF EXPANSION OF SAID EXPANSIBLE ELEMENT AS BROUGHT ABOUT BY CHANGES IN THE DEGREE OF COLLAPSING OF SAID COLLAPSIBLE THE MATERIAL IN THE CONTAINER, AND MEANS FOR MAINTAINING A SUBSTANTIALLY CONSTANT PRESSURE IN SAID FLUID SYSTEM.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |