US3567437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming porous seamless tubing
Assignee: Individual
•
Filing: 1968-05-16
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Granted: 1971-03-02
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Expires: 1988-05-16
Abstract
Abstract METAL POWDER IS POURED INTO A VERTICAL FLEXIBLE TUBULAR MOLD CONTAINING A CENTRAL CORE ROD AND A SPACER SLIGHTLY LARGER IN DIAMETER THAN THE TUBULAR MOLD AND SLIDING ON THE CORE ROD, THE SPACER IS PULLED UPWARD THROUGH THE TUBULAR MOLD TO EVENLY SPACE POWDER ABOUT THE CORE ROD, THE ENDS OF THE TUBULAR MOLD ARE STOPPED, THE TUBULAR MOLD WITH POWDER AND CORE ROD THEREIN IS PLACED IN A FLUID AND SUBJECTED TO HIGH PRESSURE TO COMPACT THE POWDER, THE TUBULAR MOLD AND CORE ROD ARE REMOVED, AND THE METAL POWDER IS SINTERED TO FORM A LENGTH OF POROUS SEAMLESS TUBING.
Inventors
- 👤 Lambert H Mott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:26
CPC Classifications
B; B22; B22F; B22F7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |