Patent US3728934A successfully refreshed from Google Patents.
US3728934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Connecting devices
Assignee: Electric Reduction Company of Canada Ltd
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Filing: 1970-07-21
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Granted: 1973-04-24
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Expires: 1990-07-21
Abstract
Abstract Irreversibly severable mechanical and/or electrical linkage useful in submarine oceanographs comprises a connecting member in contact with a thermite mixture which may be ignited so as to destroy the connecting member. Advantageously the connecting member may be of aluminum and the thermite mixture may comprise silicon and red lead.
Inventors
- 👤 M Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:22
CPC Classifications
H; H01; H01H; H01H39/00; H01H39/006
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A submarine oceanograph comprising at least two separable portions which are positioned apart and joined by a fuseable magnesium or aluminum connecting member, said connecting member being in contact with a thermite-type mixture comprising from 20 percent to 40 percent by weight of silicon and from 80 percent to 60 percent by weight of red lead, means for igniting said thermite-type mixture, a casing surrounding said thermite-type mixture, said casing being composed of a deformable material which will transmit hydrostatic pressure, whereby when said igniting means ignites said thermite-type mixture said thermitetype mixture severs said connecting member and said two separable portions become separated.
Claim 2
Dependent Claim
104 words
A submarine oceanograph comprising at least two separable portions which are positioned apart and joined by a fuseable magnesium or aluminum connecting member, said connecting member being in contact with a thermite-type mixture comprising from 20 percent to 40 percent by weight of silicon and from 80 percent to 60 percent by weight of red lead, means for igniting said thermite-type mixture, a casing surrounding said thermite-type mixture, said casing being composed of a deformable material which will transmit hydrostatic pressure, whereby when said igniting means ignites said thermite-type mixture said thermitetype mixture severs said connecting member and said two separable portions become separated.
Claim 3
Dependent Claim
28 words
A submarine oceanograph according to claim 1 wherein said thermite-type mixture comprises substantially 30 percent by weight of silicon and substantially 70 percent by weight of red lead.
Claim 4
Dependent Claim
25 words
A submarine oceanograph according to claim 1 wherein said thermite-type mixture has a particle size to be able to pass through a 60 BSM sieve.
Claim 5
Dependent Claim
13 words
A submarine oceanograph according to claim 1 wherein said deformable material is polypropylene.
References Cited (Backward Citations)
US1294327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |