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Patent US4004348A successfully refreshed from Google Patents.
US4004348A
Expired / Lapsed
US
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High pressure compass housing
Assignee: Laitram LLC
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Filing: 1975-01-16
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Granted: 1977-01-25
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Expires: 1995-01-16
Abstract
Abstract A compass housing capable of withstanding high external pressure such as encountered in deep submergence applications. The housing includes a pair of hemispherical portions interconnected to form a sealed enclosure and at least one portion being formed of a resilient material capable of expansion and contraction in the presence of varying differential pressure conditions. The housing is completely filled with a damping liquid under pressure to provide an internal pressure higher than atmospheric pressure such that in the presence of higher external pressures, the inner and outer pressures tend to equalize, thereby minimizing the differential pressure on the housing itself.
Inventors
- 👤 John T. Fowler
- 👤 William H. Key
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:53
CPC Classifications
G; G01; G01C; G01C17/00; G01C17/02; G01C17/04; G12; G12B; G12B9/00; G12B9/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A magnetic compass housing comprising: first and second housing portions each having a mating peripheral flange adapted to be secured to the other; at least one of said housing portions being formed of a resilient material being impervious to the flow of fluid therethrough and operative to expand and compress in response to differential pressure thereon; means for attaching said mating peripheral flanges in sealing relationship to form a sealed housing interior; a damping liquid contained within said housing interior and completely filling said interior; said resilient housing portion being operative in the presence of a high external pressure to compress and cause the pressure of said damping liquid to increase to approximately the external pressure.
Claim 2
Dependent Claim
116 words
A magnetic compass housing comprising: first and second housing portions each having a mating peripheral flange adapted to be secured to the other; at least one of said housing portions being formed of a resilient material being impervious to the flow of fluid therethrough and operative to expand and compress in response to differential pressure thereon; means for attaching said mating peripheral flanges in sealing relationship to form a sealed housing interior; a damping liquid contained within said housing interior and completely filling said interior; said resilient housing portion being operative in the presence of a high external pressure to compress and cause the pressure of said damping liquid to increase to approximately the external pressure.
Claim 3
Dependent Claim
60 words
A magnetic compass housing according to claim 1 wherein said damping liquid contained within said housing interior is of a quantity sufficient to expand said resilient housing portion and produce a predetermined internal pressure higher than atmospheric pressure whereby any leak in said housing will cause the flow of damping liquid from the inside of the housing to the outside.
Claim 4
Dependent Claim
32 words
A magnetic compass housing according to claim 2 wherein said first and second housing portions are each of hemispherical configuration with said mating peripheral flanges being disposed at approximately the diameter thereof.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |