US4584171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing rocket combustors
Assignee: National Aerospace Laboratories of Science and Technology Agency
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Filing: 1984-09-21
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Granted: 1986-04-22
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Expires: 2004-09-21
Abstract
Abstract A method of producing rocket combustors wherein in forming an outer cylin by a powder metallurgical method on the outer side of a cylinder provided on its outer periphery with a cooling wall of channel construction having a plurality of grooves, a low-melting alloy is used as a filler to be filled into the grooves. It is also possible to form the outer cylinder after forming a Cu plating shell on the periphery of the inner cylinder filled with the low-melting alloy.
Inventors
- 👤 Masayuki Niino
- 👤 Nobuyuki Yatsuyanagi
- 👤 Akinaga Kumakawa
- 👤 Akio Suzuki
- 👤 Masaki Sasaki
- 👤 Hiromi Gomi
- 👤 Hiroshi Sakamoto
- 👤 Yoshimichi Masuda
- 👤 Ryuzo Watanabe
- 👤 Junjiro Takekawa
- 👤 Yoshihiko Doi
- 👤 Nobuhito Kuroishi
- 👤 Yoshinobu Takeda
- 👤 Shigeki Ochi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:02
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; F; F02; F02K; F02K9/00; F02K9/42; F02K9/60; F02K9/62; F02K9/64; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49346; Y10T29/4981
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
75 words
A method of producing rocket combustors comprising the steps of: preparing a cylinder provided on its outer periphery with a cooling wall of channel construction having a plurality of grooves, filling said grooves of the cylinder with a low-melting alloy, compression molding a metal powder to a predetermined thickness around the periphery of the cylinder filled with said low-melting alloy so as to form an outer cylinder, and sintering the same after said compression molding.
Claim 2
Independent Claim
75 words
A method of producing rocket combustors comprising the steps of: preparing a cylinder provided on its outer periphery with a cooling wall of channel construction having a plurality of grooves, filling said grooves of the cylinder with a low-melting alloy, compression molding a metal powder to a predetermined thickness around the periphery of the cylinder filled with said low-melting alloy so as to form an outer cylinder, and sintering the same after said compression molding.
Claim 3
Dependent Claim
43 words
A method of producing rocket combustors as set forth in claim 1, wherein in said step of filling the low-melting alloy, a low-melting alloy is simultaneously fill within the cylinder to serve as a core during the compression molding of the outer cylinder.
Claim 4
Dependent Claim
43 words
A method of producing rocket combustors as set forth in claim 1, wherein in said step of filling the low-melting alloy, a metal core is simultaneously inserted within the cylinder to serve as a core during the compression molding of the outer cylinder.
Claim 5
Dependent Claim
43 words
A method of producing rocket combustors as set forth in claim 1, wherein said step of filling the low-melting alloy into the grooves is followed by forming a Cu plating shell around the periphery of the inner cylinder filled with the low-melting alloy.
Claim 6
Dependent Claim
35 words
A method of producing rocket combustors as set forth in claim 1, wherein in said compression molding step, copper powder mixed with slight amounts of Ag and Sn powders is used as the metal powder.
Claim 7
Dependent Claim
31 words
A method of producing rocket combustors as set forth in claim 1, wherein in said compression molding step, copper powder plated with Ag or Sn is used as the metal powder.
Claim 8
Dependent Claim
42 words
A method of producing rocket combustors as set forth in claim 1, wherein said step of filling the low-melting alloy is followed by the step of plating with Ag or Sn the outer periphery of the cylinder filled with the low-melting alloy.
Claim 9
Dependent Claim
36 words
A method of producing rocket combustors as set forth in claim 4, wherein said step of forming the Cu plating shell is followed by the step of plating said Cu plating shell with Ag or Sn.
Claim 10
Dependent Claim
30 words
A method of producing rocket combustors as set forth in claim 1, wherein a low-melting alloy having a melting point of about 50°-200° C. is used as said low-melting alloy.
References Cited (Backward Citations)
GB491416A
Cited
US3103885A
Cited
SU149226A1
Cited
FR1602258A
Cited
US3531848A
Cited
US3549357A
Cited
US4431449A
Cited
US4508680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |