Patent US3632243A successfully refreshed from Google Patents.
US3632243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming porous seamless tubing
Assignee: Mott Corp
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Filing: 1970-11-04
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Granted: 1972-01-04
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Expires: 1990-11-04
Abstract
Abstract A spacer for use with a core rod, a flexible tubular mold disposed about the core rod, means introducing a powder between the core rod and the mold, and means sealing the ends of the tubular mold so that the powder may be compacted on subjecting the mold to fluid pressure, the compacted powder being removed and sintered to form porous seamless tubing; the spacer having a cylindrical outer shell larger in diameter than the inside of the mold, guide means sliding on the core rod and fixed to the shell positioning the shell concentrically about the core rod, the spacer containing at least one longitudinal opening allowing powder to flow therethrough, and handle means extending through the mold between the mold and the core rod so the spacer may be drawn upward through the tubular mold as powder flows through the opening in the spacer to be positioned about the core rod within the mold, the tubular mold on passage of the spacer contracting to hold powder against shifting.
Inventors
- 👤 Lambert H Mott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:38
CPC Classifications
B; B22; B22F; B22F5/00; B22F5/10; B22F5/106; B22C; B22C13/00; B22C13/10; B30; B30B; B30B11/00; B30B11/001; B22F2998/00; Y; Y10; Y10S; Y10S425/00; Y10S425/01; Y10S425/019; Y10S425/044
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
202 words
Apparatus for forming porous seamless tubing comprising, in combination, a core rod, a flexible tubular mold disposed about said core rod, means introducing a powder between said core rod and said tubular mold, means sealing the ends of said tubular mold so that powder introduced into said mold may be compacted on subjecting said mold to fluid pressure and the compacted powder may then be removed and sintered to form porous seamless tubing and a spacer having a cylindrical outer shell larger in diameter than said flexible tubular mold engaging the inside of said flexible tubular mold, guide means sliding on said core rod and fixed to said shell positioning the outer surface of said shell concentrically about said core rod, said spacer containing at least one longitudinal opening allowing powder to flow therethrough, and handle means extending through said tubular mold between said core rod and said tubular mold so that said spacer may be drawn upward through said tubular mold as powder flows through said spacer to be positioned evenly about said core rod, said spacer aligning said tubular mold in relation to said core rod, said tubular mold on passage of said spacer contracting holding said powder against shifting.
Claim 2
Dependent Claim
202 words
Apparatus for forming porous seamless tubing comprising, in combination, a core rod, a flexible tubular mold disposed about said core rod, means introducing a powder between said core rod and said tubular mold, means sealing the ends of said tubular mold so that powder introduced into said mold may be compacted on subjecting said mold to fluid pressure and the compacted powder may then be removed and sintered to form porous seamless tubing and a spacer having a cylindrical outer shell larger in diameter than said flexible tubular mold engaging the inside of said flexible tubular mold, guide means sliding on said core rod and fixed to said shell positioning the outer surface of said shell concentrically about said core rod, said spacer containing at least one longitudinal opening allowing powder to flow therethrough, and handle means extending through said tubular mold between said core rod and said tubular mold so that said spacer may be drawn upward through said tubular mold as powder flows through said spacer to be positioned evenly about said core rod, said spacer aligning said tubular mold in relation to said core rod, said tubular mold on passage of said spacer contracting holding said powder against shifting.
Claim 3
Dependent Claim
19 words
The combination according to claim 1 wherein said lower edge of said outer shell terminates in a knife edge.
Claim 4
Dependent Claim
46 words
The combination according to claim 3 wherein said guide means consists of a guide ring slidably extending about said core rod and with the addition of radial arms fixing said guide ring to said outer shell, said handle means being a rod fixed to said spacer.
Claim 5
Dependent Claim
47 words
The combination according to claim 3 wherein said guide means consists of a tubular guide slidably extending about said core rod and with the addition of radial arms fixing said tubular guide to said outer shell, said handle means being an upward extension of said tubular guide.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |