Patent US4508312A successfully refreshed from Google Patents.
US4508312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ram-type blowout preventer
Assignee: Cameron International Corp
•
Filing: 1983-06-08
•
Granted: 1985-04-02
•
Expires: 2003-06-08
Abstract
Abstract A ram-type blowout preventer having a housing with a vertical bore, aligned ram guideways extending outward from opposite sides of the bore, a ram in each guideway, means for moving the rams inward and outward in the guideways to open and close on a drill or pipe string in the bore, a packer in each ram having a packing with an upper slotted plate thereon and a lower slotted plate therebelow, the plates being sufficiently flexible to move into close proximity to a string when the rams are closed thereon to support the packing against extrusion.
Inventors
- 👤 William M. Taylor
- 👤 Bolie C. Williams, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:01
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/061; E21B33/062
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
A ram-type blowout preventer comprising a housing having a bore and aligned, opposed ram guideways extending outward from said bore, a ram in each ram guideway, means for moving the rams in the guideways, a ram front packer in each of the rams and including means for sealing across the top of each ram connecting with the sides of said packer, a single unitary upper ram packer plate, a single unitary lower ram packer plate, and packing between the plates, said ram plates being embedded in said packing and slotted to be sufficiently flexible to yield and move into close proximity with a drill or pipe string in the housing bore when the rams are closed whereby the packing when sealed on the string is provided with sufficient support to prevent its extrusion.
Claim 2
Dependent Claim
133 words
A ram-type blowout preventer comprising a housing having a bore and aligned, opposed ram guideways extending outward from said bore, a ram in each ram guideway, means for moving the rams in the guideways, a ram front packer in each of the rams and including means for sealing across the top of each ram connecting with the sides of said packer, a single unitary upper ram packer plate, a single unitary lower ram packer plate, and packing between the plates, said ram plates being embedded in said packing and slotted to be sufficiently flexible to yield and move into close proximity with a drill or pipe string in the housing bore when the rams are closed whereby the packing when sealed on the string is provided with sufficient support to prevent its extrusion.
Claim 3
Dependent Claim
15 words
A blowout preventer according to claim 1 wherein said plates include a plurality of slots.
Claim 4
Dependent Claim
23 words
A blowout preventer according to claim 1 wherein said plates include a plurality of slots extending therein from their front and rear edges.
Claim 5
Dependent Claim
37 words
A blowout preventer according to claim 1 wherein said plates have a central face recess and a central rear projection, and said plates include slots extending into said plates from said face recesses and said rear projections.
Claim 6
Dependent Claim
93 words
A ram-type blowout preventer comprising a housing having a bore and aligned, opposed ram guideways extending outward from said bore, a ram in each ram guideway, means for moving the rams in the guideways, a packer in each of the rams and including an upper plate, a lower plate, and packing between the plates, said plates having slots to provide a preselected amount of flexibility about the axis of said housing bore whereby said plates engage a drill or pipe string on which the rams are closed to protect said packing from extrusion.
Claim 7
Dependent Claim
93 words
A ram-type blowout preventer comprising a housing having a bore and aligned, opposed ram guideways extending outward from said bore, a ram in each ram guideway, means for moving the rams in the guideways, a packer in each of the rams and including an upper plate, a lower plate, and packing between the plates, said plates having slots to provide a preselected amount of flexibility about the axis of said housing bore whereby said plates engage a drill or pipe string on which the rams are closed to protect said packing from extrusion.
Claim 8
Dependent Claim
65 words
A ram packer for a ram-type blowout preventer comprising an upper plate, a lower plate, and packing between the plates, said plates having sufficient flexibility to flex about the axis of the housing bore when the rams are closed on a drill or pipe string and move into close proximity with a string therein while having sufficient transverse rigidity to prevent extrusion of said packing.
Claim 9
Dependent Claim
65 words
A ram packer for a ram-type blowout preventer comprising an upper plate, a lower plate, and packing between the plates, said plates having sufficient flexibility to flex about the axis of the housing bore when the rams are closed on a drill or pipe string and move into close proximity with a string therein while having sufficient transverse rigidity to prevent extrusion of said packing.
Claim 10
Dependent Claim
14 words
A packer according to claim 6 wherein said plates include a plurality of slots.
Claim 11
Dependent Claim
22 words
A packer according to claim 6 wherein said plates include a plurality of slots extending therein from their front and rear edges.
Claim 12
Dependent Claim
36 words
A packing according to claim 6 wherein said plates have a central face recess and a central rear projection, and said plates include slots extending into said plates from said face recesses and said rear projections.
References Cited (Backward Citations)
US1653439A
Cited
GB267950A
Cited
US3356377A
Cited
DE2234285A1
Cited
US3915424A
Cited
US3836158A
Cited
US4044988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |