Patent US3961513A successfully refreshed from Google Patents.
US3961513A
Expired / Lapsed
US
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Method of making pipe fittings
Assignee: Elkhart Products Corp
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Filing: 1975-04-11
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Granted: 1976-06-08
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Expires: 1995-04-11
Abstract
Abstract A method of making a pipe fitting having a generally T-shape wherein a solid plug of malleable metal is first deformed to provide a tube closed at one end and having a thicker wall adjacent the closed end and thereafter further deforming the tube to provide a pair of legs adjacent the one end.
Inventors
- 👤 H. La Mar Stahly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:39
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/28; B21C37/29; B21C37/294; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428; Y10T29/49442
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A method for producing a wrought fitting having three legs arranged in a generally T-shape comprising the steps of: cold deforming a solid plug of malleable metal to provide a tube closed at one end and having a tube wall thickness adjacent said one end greater than the tube wall thickness remote from said one end, confining said tube in die means having relief zones on each side of said tube adapted to develop curved legs extending from the sides of said tube, further deforming said tube in a single step by utilizing a ram to extrude said tube while internally pressurizing said tube with fluid to provide a pair of curved legs adjacent said one end, and severing the ends of said legs.
Claim 2
Independent Claim
124 words
A method for producing a wrought fitting having three legs arranged in a generally T-shape comprising the steps of: cold deforming a solid plug of malleable metal to provide a tube closed at one end and having a tube wall thickness adjacent said one end greater than the tube wall thickness remote from said one end, confining said tube in die means having relief zones on each side of said tube adapted to develop curved legs extending from the sides of said tube, further deforming said tube in a single step by utilizing a ram to extrude said tube while internally pressurizing said tube with fluid to provide a pair of curved legs adjacent said one end, and severing the ends of said legs.
Claim 3
Dependent Claim
21 words
The method of claim 1 in which the differential thickness in the tube wall is of the order of 0.010 inch.
Claim 4
Dependent Claim
25 words
The method of claim 1 in which said tube is thereafter curved in the portion remote from said one end to provide a tripod-like configuration.
References Cited (Backward Citations)
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Cited
US2198643A
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US2238212A
Cited
US2858787A
Cited
US3225423A
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US3681960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |