Patent US3763738A successfully refreshed from Google Patents.
US3763738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosively operated deep water tool
Assignee: MSA Safety Inc
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Filing: 1972-07-03
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Granted: 1973-10-09
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Expires: 1992-07-03
Abstract
Abstract A piston is slidably mounted in the opposite end portions of a barrel, the central portion of which is spaced from the piston. Mounted on the front end of the piston is an operating member, such as a cable cutter. The rear end of the barrel is provided with means for firing an explosive charge to drive the piston forward. A collar is joined to the piston and slidably engages the wall of the central portion of the barrel. This wall has openings through it behind the collar so that water pressure against the front end of the piston will be at least partly counterbalanced by water pressure against the rear face of the collar.
Inventors
- 👤 E Temple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:05
CPC Classifications
B; B63; B63B; B63B21/00; B63B21/56; B63B21/58; B63B21/60; B23; B23D; B23D15/00; B23D15/12; B23D15/14; B23D15/145; H; H02; H02G; H02G1/00; H02G1/005; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/8821; Y10T83/8858; Y10T83/8863
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
A deep water explosively actuated tool comprising a barrel having an open front and a rear end, the central portion of the barrel having a larger internal diameter than the end portions thereof, a piston slidably mounted in said end portions of the barrel but spaced from the inner surface of said central portion, an operating member mounted on the front end of the piston, means at the rear end of the barrel for detonating an explosive charge for driving the piston forward in the barrel, and a collar joined to the piston and slidably engaging the inner surface of said central portion of the barrel, the wall of said central portion being provided with openings behind the collar connecting the inside of the barrel with the outside, whereby water pressure against the front end of the piston will be at least partly counterbalanced by water pressure against the rear face of the collar.
Claim 2
Dependent Claim
154 words
A deep water explosively actuated tool comprising a barrel having an open front and a rear end, the central portion of the barrel having a larger internal diameter than the end portions thereof, a piston slidably mounted in said end portions of the barrel but spaced from the inner surface of said central portion, an operating member mounted on the front end of the piston, means at the rear end of the barrel for detonating an explosive charge for driving the piston forward in the barrel, and a collar joined to the piston and slidably engaging the inner surface of said central portion of the barrel, the wall of said central portion being provided with openings behind the collar connecting the inside of the barrel with the outside, whereby water pressure against the front end of the piston will be at least partly counterbalanced by water pressure against the rear face of the collar.
Claim 3
Dependent Claim
33 words
A tool according to claim 1, in which said piston is provided inside said end portions of the barrel with circumferential grooves, and sealing rings in said grooves tightly engaging said end portions.
Claim 4
Dependent Claim
31 words
A tool according to claim 1, in which the total cross sectional area of said openings is at least as great as the area of the rear face of said collar.
Claim 5
Dependent Claim
35 words
A tool according to claim 1, in which the area of the rear face of said collar is substantially equal to the cross sectional area of the piston in the front end of the barrel.
Claim 6
Dependent Claim
64 words
A tool according to claim 1, in which said piston is provided inside said end portions of the barrel with circumferential grooves, sealing rings in said grooves tightly engaging said end portions, the periphery of said collar being provided with a circumferential groove, and the collar including a sealing ring in its groove tightly engaging said wall of the central portion of the barrel.
Claim 7
Dependent Claim
59 words
A tool according to claim 5, in which the area of the rear face of said collar is substantially equal to the cross sectional area of the piston in the front end of the barrel, and the total cross sectional area of said openings is at least as great as the area of the rear face of the collar.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |