Patent US1352494A successfully refreshed from Google Patents.
Patent US3302446A successfully refreshed from Google Patents.
US3302446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detecting an expendable oil pipe line plug
Assignee: Shell USA Inc
•
Filing: 1964-02-17
•
Granted: 1967-02-07
•
Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 David L Schmitt
- 👤 Paul L Datt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:58
CPC Classifications
G; G01; G01F; G01F25/00; G01F25/10; G01F25/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
AN APPARATUS FOR DETERMINING AT A POINT IN A PIPE LINE THE MIDPOINT OF A MARKER MATERIAL THAT IS INJECTED INTO A FLUID FLOWING IN A PIPE LINE AND SUBSEQUENTLY DISPERSES IN SAID FLUID, SAID APPARATUS COMPRISING: A DETECTOR POSITIONED ON SAID PIPE LINE AT SAID POINT TO DETECT THE PASSAGE OF SAID MARKER MATERIAL, SAID DETECTOR SUPPLYING AN ELECTRICAL SIGNAL RELATED TO THE QUANTITY OF SAID MARKER MATERIAL PRESENT IN SAID FLUID; AN AMPLIFYING MEANS, SAID AMPLIFYING MEANS BEING COUPLED TO SAID DETECTOR TO AMPLIFY SAID ELECTRICAL SIGNAL; A PEAK STORAGE CIRCUIT, SAID PEAK STORAGE CIRCUIT BEING COUPLED TO SAID AMPLIFIER; AND A DIFFERENCE AMPLIFIER, SAID DIFFERENCE AMPLIFIER BEING COUPLED TO BOTH SAID AMPLIFYING MEANS AND SAID PEAK STORAGE DEVICE TO COMPARE THE INSTANTANEOUS VALUE OF SAID ELECTRICAL SIGNAL WITH THE PEAK VALUE AND SUPPLY AN OUTPUT SIGNAL WHEN SAID INSTANTANEOUS VALUE IS LESS THAN SAID PEAK VALUE.
Claim 2
Independent Claim
149 words
AN APPARATUS FOR DETERMINING AT A POINT IN A PIPE LINE THE MIDPOINT OF A MARKER MATERIAL THAT IS INJECTED INTO A FLUID FLOWING IN A PIPE LINE AND SUBSEQUENTLY DISPERSES IN SAID FLUID, SAID APPARATUS COMPRISING: A DETECTOR POSITIONED ON SAID PIPE LINE AT SAID POINT TO DETECT THE PASSAGE OF SAID MARKER MATERIAL, SAID DETECTOR SUPPLYING AN ELECTRICAL SIGNAL RELATED TO THE QUANTITY OF SAID MARKER MATERIAL PRESENT IN SAID FLUID; AN AMPLIFYING MEANS, SAID AMPLIFYING MEANS BEING COUPLED TO SAID DETECTOR TO AMPLIFY SAID ELECTRICAL SIGNAL; A PEAK STORAGE CIRCUIT, SAID PEAK STORAGE CIRCUIT BEING COUPLED TO SAID AMPLIFIER; AND A DIFFERENCE AMPLIFIER, SAID DIFFERENCE AMPLIFIER BEING COUPLED TO BOTH SAID AMPLIFYING MEANS AND SAID PEAK STORAGE DEVICE TO COMPARE THE INSTANTANEOUS VALUE OF SAID ELECTRICAL SIGNAL WITH THE PEAK VALUE AND SUPPLY AN OUTPUT SIGNAL WHEN SAID INSTANTANEOUS VALUE IS LESS THAN SAID PEAK VALUE.
References Cited (Backward Citations)
US3089030A
Cited
US3028744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |