Patent US3397562A successfully refreshed from Google Patents.
US3397562A
Expired / Lapsed
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Method and apparatus for the extrusion of metal tubes and billets by an initial impulsive force and the subsequent application of uniform extrusion forces
Assignee: AT&T Inc
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Filing: 1966-04-08
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Granted: 1968-08-20
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Expires: 1986-04-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Francis J Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:42
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE METHOD OF EXTRUDING A BILLET, COMPRISING THE STEPS OF: GENERATING A FORCE FROM A SINGLE SOURCE SUFFICIENTLY GREAT TO BOTH EXTRUDE SAID BILLET THROUGH A DIE AND TO OVERCOME STATIC FRICTION BETWEEN SAID BILLET AND SAID DIE, APPLYING SAID FORCE SUDDENLY TO SAID BILLET TO OVERCOME SAID FRICTION AND TO INITIATE EXTRUSION OF SAID BILLET THROUGH SAID DIE, AND THEREAFTER, CONTROLLING SAID FORCE APPLIED TO SAID BILLET AT A SUBSTANTIALLY CONSTANT LEVEL SUFFICIENT TO CONTINUE TO EXTRUDE SAID BILLET THROUGH SAID DIE.
Claim 2
Independent Claim
83 words
THE METHOD OF EXTRUDING A BILLET, COMPRISING THE STEPS OF: GENERATING A FORCE FROM A SINGLE SOURCE SUFFICIENTLY GREAT TO BOTH EXTRUDE SAID BILLET THROUGH A DIE AND TO OVERCOME STATIC FRICTION BETWEEN SAID BILLET AND SAID DIE, APPLYING SAID FORCE SUDDENLY TO SAID BILLET TO OVERCOME SAID FRICTION AND TO INITIATE EXTRUSION OF SAID BILLET THROUGH SAID DIE, AND THEREAFTER, CONTROLLING SAID FORCE APPLIED TO SAID BILLET AT A SUBSTANTIALLY CONSTANT LEVEL SUFFICIENT TO CONTINUE TO EXTRUDE SAID BILLET THROUGH SAID DIE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |