Patent US3220256A successfully refreshed from Google Patents.
US3220256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear flow meter
Assignee: NAT INSTR LAB Inc
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Filing: 1962-09-12
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Granted: 1965-11-30
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Expires: 1982-09-12
Abstract
No abstract record available.
Inventors
- 👤 Weichbrod Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:07
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A FLUID RESTRICTOR FOR LINEAR FLOW METERS COMPRISING AN ELONGATED FLOW ELEMENT HAVING A FLUID ENTRANCEWAY AND A FLUID EXIT PASSAGE AT THE END THEREOF, A PAIR OF SPACED APART PRESSURE TAPS POSITIONED ON SAID FLOW ELEMENT INTERMEDIATE THE ENDS THEREOF ADAPTED FOR CONNECTION TO AN INDICATING INSTRUMENT, SOLID IMPERFORATE MATERIAL INTERMEDIATE SAID PRESSURE TAPS BLOCKING FLUID FLOW THROUGH THE FLOW ELEMENT, AND A SUBSTANTIALLY UNIMPEDED FLUID FLOW RESTRICTING CHANNEL INSIDE SAID FLOW ELEMENT EXTENDING THROUGH SAID IMPERFORATE MATERIAL AND CONNECTED TO THE TAPS, SAID CHANNEL EXHIBITING IN CROSS-SECTION A GENERALLY RECTANGULAR SHAPE, SAID RECTANGULAR SHAPE HAVING SUBSTANTIALLY UNIFORM CHANNEL DEPTH RANGING FROM 0.002-0.100 INCH AND A WIDTH AT LEAST TEN TIMES THE DEPTH, THE UPSTREAM PRESSURE TAP BEING POSITIONED TO COMMUNICATE WITH SAID CHANNEL AT A LOCATION DOWNSTREAM OF THE FLUID ENTRANCE THERETO.
Claim 2
Dependent Claim
134 words
A FLUID RESTRICTOR FOR LINEAR FLOW METERS COMPRISING AN ELONGATED FLOW ELEMENT HAVING A FLUID ENTRANCEWAY AND A FLUID EXIT PASSAGE AT THE END THEREOF, A PAIR OF SPACED APART PRESSURE TAPS POSITIONED ON SAID FLOW ELEMENT INTERMEDIATE THE ENDS THEREOF ADAPTED FOR CONNECTION TO AN INDICATING INSTRUMENT, SOLID IMPERFORATE MATERIAL INTERMEDIATE SAID PRESSURE TAPS BLOCKING FLUID FLOW THROUGH THE FLOW ELEMENT, AND A SUBSTANTIALLY UNIMPEDED FLUID FLOW RESTRICTING CHANNEL INSIDE SAID FLOW ELEMENT EXTENDING THROUGH SAID IMPERFORATE MATERIAL AND CONNECTED TO THE TAPS, SAID CHANNEL EXHIBITING IN CROSS-SECTION A GENERALLY RECTANGULAR SHAPE, SAID RECTANGULAR SHAPE HAVING SUBSTANTIALLY UNIFORM CHANNEL DEPTH RANGING FROM 0.002-0.100 INCH AND A WIDTH AT LEAST TEN TIMES THE DEPTH, THE UPSTREAM PRESSURE TAP BEING POSITIONED TO COMMUNICATE WITH SAID CHANNEL AT A LOCATION DOWNSTREAM OF THE FLUID ENTRANCE THERETO.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |