Patent US698926A successfully refreshed from Google Patents.
Patent US4530740A successfully refreshed from Google Patents.
US4530740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing closed canals in components such as heat exchangers and rocket combustion chamber walls
Assignee: Airbus Defence and Space GmbH
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Filing: 1984-04-27
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Granted: 1985-07-23
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Expires: 2004-04-27
Abstract
Abstract A method of closing a canal which has been formed in a wall of a component such as a heat exchanger for rocket combustion chamber walls comprises inserting an elongated filler into the canal so as to leave at least one end of the filler which projects out of the canal, filling the remaining space with an electrically conducting melting substance such as a wax, engaging the projecting end of the filler to pull it out of the substance in the canal and to leave the expanding chamber in the substance, an electroplating metalloplastic material onto the component to form a cover over the canal and the substance therein. Electroplating can be carried out without causing any heat which is produced thereby to affect an expansion in the canal which would disturb the electroplating or the formation of the component.
Inventors
- 👤 Dietmar Wolf
- 👤 Otto Tuscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:52
CPC Classifications
C; C25; C25D; C25D1/00; C25D1/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
A method of closing a canal in a wall of a chamber, comprising inserting an enlongated filler into the canal leaving at least one end of the filler which projects out of the canal, filling a remaining space of the canal with an electrically conducting meltable substance, engaging the projecting end of the filler, pulling the engaged projecting end of the filler out of the substance in the canal leaving an expansion chamber with a hole therein extending to a surface of the substance in the canal, the filler being pulled out of the substance when the substance is at a temperature which is above room temperature so that the substance becomes slightly plastic, plugging the hole to form a continuous surface for the substance in the canal, electroplating metal plastic material to the component to form a cover over the canal and over the continuous surface of the substance in the canal, whereby heat produced during the electroplating causes expansion of the substance into the expansion chamber, and subsequently melting the meltable substance out of the canal.
Claim 2
Independent Claim
178 words
A method of closing a canal in a wall of a chamber, comprising inserting an enlongated filler into the canal leaving at least one end of the filler which projects out of the canal, filling a remaining space of the canal with an electrically conducting meltable substance, engaging the projecting end of the filler, pulling the engaged projecting end of the filler out of the substance in the canal leaving an expansion chamber with a hole therein extending to a surface of the substance in the canal, the filler being pulled out of the substance when the substance is at a temperature which is above room temperature so that the substance becomes slightly plastic, plugging the hole to form a continuous surface for the substance in the canal, electroplating metal plastic material to the component to form a cover over the canal and over the continuous surface of the substance in the canal, whereby heat produced during the electroplating causes expansion of the substance into the expansion chamber, and subsequently melting the meltable substance out of the canal.
Claim 3
Dependent Claim
16 words
A method according to claim 1, including inserting a solid non-hollow elongated filler into the canal.
Claim 4
Dependent Claim
13 words
A method according to claim 2, wherein the filler comprises a plastic string.
Claim 5
Dependent Claim
13 words
A method according to claim 2, wherein the filler comprises a metal wire.
Claim 6
Dependent Claim
15 words
A method according to claim 4, wherein the filler comprises a smooth surfaced aluminum wire.
Claim 7
Dependent Claim
39 words
A method according to claim 2, wherein the substance is wax, the hole is plugged with wax, and the filler is pulled from the substance when the substance is at a temperature of about 30° to to 50° C.
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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |