US3105552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casing suspension system
Assignee: Shell USA Inc
•
Filing: 1960-07-27
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Granted: 1963-10-01
•
Expires: 1980-07-27
Abstract
No abstract record available.
Inventors
- 👤 John A Haeber
- 👤 Lloyd G Otteman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:18
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A WELLHEAD APPARATUS ADAPTED TO BE POSITIONED AT THE TOP OF A WELL FOR SUSPENDING A COMBINATION OF TUBING AND CASING STRINGS IN THE WELL, SAID APPARATUS COMPRISING A CASINGHEAD FIXEDLY POSITIONED COAXIALLY OVER SAID WELL, SAID CASINGHEAD HAVING AT LEAST ONE SEATING SHOULDER FORMED THEREIN, A FIRST CASING HANGER HAVING SEATING SHOULDERS FORMED ON THE INSIDE AND OUTSIDE THEREOF, SAID OUTSIDE SHOULDER BEING FORMED TO SEAT ON A SHOULDER WITHIN THE CASINGHEAD, A FIRST STRING OF CASING SECURED TO AND SUSPENDING FROM THE FIRST CASING HANGER, A SECOND CASING HANGER HAVING SEATING SHOULDERS FORMED ON AT LEAST THE OUTSIDE THEREOF, SAID OUTER SHOULDER BEING FORMED TO SEAT ON THE SHOULDER WITHIN SAID FIRST CASING HANGER, A SECOND STRING OF CASING SECURED TO AND SUSPENDING FROM THE SECOND CASING HANGER, AND HOLD-DOWN SLIP MEANS CARRIED OUTWARDLY BY EACH OF SAID CASING HANGERS AND POSITIONED TO ENGAGE THE INNER SURFACE OF SAID CASINGHEAD.
Claim 2
Dependent Claim
152 words
A WELLHEAD APPARATUS ADAPTED TO BE POSITIONED AT THE TOP OF A WELL FOR SUSPENDING A COMBINATION OF TUBING AND CASING STRINGS IN THE WELL, SAID APPARATUS COMPRISING A CASINGHEAD FIXEDLY POSITIONED COAXIALLY OVER SAID WELL, SAID CASINGHEAD HAVING AT LEAST ONE SEATING SHOULDER FORMED THEREIN, A FIRST CASING HANGER HAVING SEATING SHOULDERS FORMED ON THE INSIDE AND OUTSIDE THEREOF, SAID OUTSIDE SHOULDER BEING FORMED TO SEAT ON A SHOULDER WITHIN THE CASINGHEAD, A FIRST STRING OF CASING SECURED TO AND SUSPENDING FROM THE FIRST CASING HANGER, A SECOND CASING HANGER HAVING SEATING SHOULDERS FORMED ON AT LEAST THE OUTSIDE THEREOF, SAID OUTER SHOULDER BEING FORMED TO SEAT ON THE SHOULDER WITHIN SAID FIRST CASING HANGER, A SECOND STRING OF CASING SECURED TO AND SUSPENDING FROM THE SECOND CASING HANGER, AND HOLD-DOWN SLIP MEANS CARRIED OUTWARDLY BY EACH OF SAID CASING HANGERS AND POSITIONED TO ENGAGE THE INNER SURFACE OF SAID CASINGHEAD.
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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) | 1966-09-30 | 1967-04-01 | 1967-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-30 | 1971-04-01 | 1971-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-30 | 1975-04-01 | 1975-10-01 | $7700.00 | Window Closed / Lapsed |