Patent US3279539A successfully refreshed from Google Patents.
US3279539A
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Well casing hanger and method for hanging same
Assignee: Richfield Oil Corp
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Filing: 1965-02-12
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Granted: 1966-10-18
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Expires: 1985-02-12
Abstract
No abstract record available.
Inventors
- 👤 Cicero C Brown
- 👤 Jr Charles E Wakefield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:06
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/10; E21B33/00; E21B33/02; E21B33/03; E21B33/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A CASING HANGER ASSEMBLY FOR USE WITH A CASING HEAD HAVING A SHOULDER THEREIN, COMPRISING IN COMBINA TION: (A) A CASING HANGER MANDREL ADAPTED TO LAND ON SAID SHOULDER OF SAID CASING HEAD; (B) MEANS DEFINING AN ANNULAR PATH BETWEEN SAID MANDREL AND SAID CASING HEAD, THROUGH WHICH PATH FLUIDS CAN PASS WHEN SAID MANDREL IS LANDED ON SAID CASING HEAD SHOULDER, AND (C) MEANS ASSOCIATED WITH SAID MANDREL FOR EFFECTINH A SEAL BETWEEN SAID MANDREL AND SAID CASING HEAD,
Claim 2
Dependent Claim
80 words
A CASING HANGER ASSEMBLY FOR USE WITH A CASING HEAD HAVING A SHOULDER THEREIN, COMPRISING IN COMBINA TION: (A) A CASING HANGER MANDREL ADAPTED TO LAND ON SAID SHOULDER OF SAID CASING HEAD; (B) MEANS DEFINING AN ANNULAR PATH BETWEEN SAID MANDREL AND SAID CASING HEAD, THROUGH WHICH PATH FLUIDS CAN PASS WHEN SAID MANDREL IS LANDED ON SAID CASING HEAD SHOULDER, AND (C) MEANS ASSOCIATED WITH SAID MANDREL FOR EFFECTINH A SEAL BETWEEN SAID MANDREL AND SAID CASING HEAD,
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |