Patent US4442894A successfully refreshed from Google Patents.
US4442894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary float valve and wiping plug retainer
Assignee: First Interstate Bank of Texas NA
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Filing: 1982-06-07
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Granted: 1984-04-17
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Expires: 2002-06-07
Abstract
Abstract A cementing float valve for subterranean wells is provided wherein a wiping plug retaining sleeve is concentrically positioned on the top of a float valve and secured to an outer housing by cementitous or other drillable material. the retaining sleeve provides a downwardly facing latching surface and a seal bore disposed above the latching surface for cooperation respectively with an expandable ring and an annular seal conventionally provided on a wiping plug.
Inventors
- 👤 Rudy B. Callihan
- 👤 Clyde Wainwright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:31
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
162 words
A drillable cementing float valve for subterranean wells comprising: a tubular housing; means on at least one end of said housing for connection of a well conduit; a unidirectional flow valve unit having an annular housing assemblage including a cylindrical portion snugly fitting within the bore of said tubular housing and operable to permit only downward flow of cementing fluid; a sleeve mounted in said tubular housing above said valve unit; said sleeve having a depending annular flange extending into the bore of said annular housing assemblage and engagable therewith to maintain the concentricity of the sleeve with the axis of said tubular housing; means in said sleeve defining a downwardly facing, latching shoulder; and means for rigidly securing said valve unit and said sleeve within said tubular housing, whereby a conduit wiping plug may be sealingly latched to said downwardly facing latching shoulder to resist movement in one direction, said wiping plug being sealingly engaged with the bore of said sleeve.
Claim 2
Dependent Claim
162 words
A drillable cementing float valve for subterranean wells comprising: a tubular housing; means on at least one end of said housing for connection of a well conduit; a unidirectional flow valve unit having an annular housing assemblage including a cylindrical portion snugly fitting within the bore of said tubular housing and operable to permit only downward flow of cementing fluid; a sleeve mounted in said tubular housing above said valve unit; said sleeve having a depending annular flange extending into the bore of said annular housing assemblage and engagable therewith to maintain the concentricity of the sleeve with the axis of said tubular housing; means in said sleeve defining a downwardly facing, latching shoulder; and means for rigidly securing said valve unit and said sleeve within said tubular housing, whereby a conduit wiping plug may be sealingly latched to said downwardly facing latching shoulder to resist movement in one direction, said wiping plug being sealingly engaged with the bore of said sleeve.
Claim 3
Dependent Claim
40 words
The cementing float valve of claim 1 wherein said means for securing said valve unit comprises an annular layer of cementitous material surrounding portions of said valve unit and said sleeve and anchored to the bore of said tubular housing.
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) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |