Patent US3226977A successfully refreshed from Google Patents.
US3226977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safe operating condition indicator
Assignee: Shell USA Inc
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Filing: 1963-07-26
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Granted: 1966-01-04
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Expires: 1983-07-26
Abstract
No abstract record available.
Inventors
- 👤 Robert H Kolb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:40
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/18; G08B21/182
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
245 words
A SYSTEM FOR INDICATING THE CLOSENESS OF THE TOTAL STRESS ON A STRING OF PIPE TO THE MAXIMUM PERMISSIBLE STRESS FOR THE STRING OF PIPE COMPRISING: PLATFORM FLOATING ON THE SURFACE OF A BODY OF WATER; A STRING OF PIPE EXTENDING DOWNWARDLY FROM SAID FLOATING PLATFORM TO A SUBMERGED WELL; A FIRST TRANSDUCER MEANS MOUNTED ON SAID PLATFORM FOR DETERMINING THE ANGULAR DEFLECTION OF THE STRING OF PIPE FROM AN AXIS PERPENDICULAR TO THE DECK OF SAID PLATFORM AND SUPPLYING AN ELECTRICAL OUTPUT SIGNAL RELATED THERETO; A SECOND TRANSDUCER MEANS DISPOSED TO DETERMINE THE AXIAL LOAD ON SAID STRING OF PIPE AND SUPPLYING AN ELECTRICAL OUTPUT SIGNAL RELATED THERETO; CONVERTER MEANS COUPLED TO THE OUTPUT OF SAID SECOND TRANSDUCER MEANS FOR CONVERTING THE SIGNAL RELATED TO SAID AXIAL LOAD TO A SIGNAL RELATED TO THE AXIAL STRESS IN SAID STRING OF PIPE; AND X-Y PLOTTER, SAID X-Y PLOTTER HAVING ONE OF ITS SIGNAL INPUT TERMINALS COUPLED TO THE OUTPUT OF SAID FIRST TRANSDUCER MEANS AND THE OTHER OF ITS SIGNAL INPUT TERMINALS COUPLED TO THE OUTPUT OF SAID CONVERTER MEANS; AND, A CHART MOUNTED ON SAID X-Y PLOTTER, SAID CHART HAVING PRE-RECORDED THEREON A CURVE CORRESPONDING TO THE MAXIMUM PERMISSIBLE STRESS CURVE FOR THE PARTICULAR PIPE BEING USED, WHEREBY THE PROXIMITY OF THE RESULTANT PLOTTER INDICATION TO THE PRE-RECORDED CURVE IS AN INDICATION OF THE CLOSENESS OF THE TOTAL STRESS ON SAID STRING OF PIPE TO THE MAXIMUM PERMISSIBLE STRESS OF SAID STRING OF PIPE.
Claim 2
Independent Claim
245 words
A SYSTEM FOR INDICATING THE CLOSENESS OF THE TOTAL STRESS ON A STRING OF PIPE TO THE MAXIMUM PERMISSIBLE STRESS FOR THE STRING OF PIPE COMPRISING: PLATFORM FLOATING ON THE SURFACE OF A BODY OF WATER; A STRING OF PIPE EXTENDING DOWNWARDLY FROM SAID FLOATING PLATFORM TO A SUBMERGED WELL; A FIRST TRANSDUCER MEANS MOUNTED ON SAID PLATFORM FOR DETERMINING THE ANGULAR DEFLECTION OF THE STRING OF PIPE FROM AN AXIS PERPENDICULAR TO THE DECK OF SAID PLATFORM AND SUPPLYING AN ELECTRICAL OUTPUT SIGNAL RELATED THERETO; A SECOND TRANSDUCER MEANS DISPOSED TO DETERMINE THE AXIAL LOAD ON SAID STRING OF PIPE AND SUPPLYING AN ELECTRICAL OUTPUT SIGNAL RELATED THERETO; CONVERTER MEANS COUPLED TO THE OUTPUT OF SAID SECOND TRANSDUCER MEANS FOR CONVERTING THE SIGNAL RELATED TO SAID AXIAL LOAD TO A SIGNAL RELATED TO THE AXIAL STRESS IN SAID STRING OF PIPE; AND X-Y PLOTTER, SAID X-Y PLOTTER HAVING ONE OF ITS SIGNAL INPUT TERMINALS COUPLED TO THE OUTPUT OF SAID FIRST TRANSDUCER MEANS AND THE OTHER OF ITS SIGNAL INPUT TERMINALS COUPLED TO THE OUTPUT OF SAID CONVERTER MEANS; AND, A CHART MOUNTED ON SAID X-Y PLOTTER, SAID CHART HAVING PRE-RECORDED THEREON A CURVE CORRESPONDING TO THE MAXIMUM PERMISSIBLE STRESS CURVE FOR THE PARTICULAR PIPE BEING USED, WHEREBY THE PROXIMITY OF THE RESULTANT PLOTTER INDICATION TO THE PRE-RECORDED CURVE IS AN INDICATION OF THE CLOSENESS OF THE TOTAL STRESS ON SAID STRING OF PIPE TO THE MAXIMUM PERMISSIBLE STRESS OF SAID STRING OF PIPE.
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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |