Patent US3217402A successfully refreshed from Google Patents.
US3217402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing tubular metal bodies with welded helical seams of strip stock
Assignee: DRIAM SA
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Filing: 1962-12-31
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Granted: 1965-11-16
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Expires: 1982-12-31
Abstract
No abstract record available.
Inventors
- 👤 Eckhardt Vilem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:37
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A METHOD OF PRODUCING TUBULAR BODIES WITH WELDED HELICAL SEAMS, SUCH AS PIPES OR THE LIKE, FROM METAL STRIP COMPRISING THE STEPS OF SIMULTANEOUSLY PLACING MARKS ON OPPOSITE LATERAL EDGES OF SAID STRIP WHICH MARKS ARE SPACED APART AT DISTANCES WHICH ARE FUNCTION OF THE LENGTH OF THE CIRCUMFERENCE OF THE TUBULAR BODY TO BE FORMED, GUIDING SAID STRIP IN A CURVILINEAR DIRECTION, UTILIZING THE FORCE OF GRAVITY FOR DETERMINING THE DEGREE OF CURVATURE IN SAID CURVILINEAR DIRECTION, APPLYING A DRIVING FORCE FOR COILING SAID STRIP ABOUT A LONGITUDINAL AXIS, AND ENGAGING ADJACENT ONES OF SAID OPPOSITE LATERAL EDGES TO CAUSE SAID MARKS ON ONE OF SAID ADJACENT ONES TO SUCCESSIVELY ASSUME SUBSTANTIALLY IDENTICAL RELATIONSHIPS WITH THE MARKS ON THE OTHER ONE OF SAID ADJACENT ONES OF SAID LATERAL EDGES, AND SUCCESSIVELY WELDING TOGETHER SAID ADJACENT ONES OF SAID EDGES AT A PREDETERMINED WELDING POINT.
Claim 2
Independent Claim
145 words
A METHOD OF PRODUCING TUBULAR BODIES WITH WELDED HELICAL SEAMS, SUCH AS PIPES OR THE LIKE, FROM METAL STRIP COMPRISING THE STEPS OF SIMULTANEOUSLY PLACING MARKS ON OPPOSITE LATERAL EDGES OF SAID STRIP WHICH MARKS ARE SPACED APART AT DISTANCES WHICH ARE FUNCTION OF THE LENGTH OF THE CIRCUMFERENCE OF THE TUBULAR BODY TO BE FORMED, GUIDING SAID STRIP IN A CURVILINEAR DIRECTION, UTILIZING THE FORCE OF GRAVITY FOR DETERMINING THE DEGREE OF CURVATURE IN SAID CURVILINEAR DIRECTION, APPLYING A DRIVING FORCE FOR COILING SAID STRIP ABOUT A LONGITUDINAL AXIS, AND ENGAGING ADJACENT ONES OF SAID OPPOSITE LATERAL EDGES TO CAUSE SAID MARKS ON ONE OF SAID ADJACENT ONES TO SUCCESSIVELY ASSUME SUBSTANTIALLY IDENTICAL RELATIONSHIPS WITH THE MARKS ON THE OTHER ONE OF SAID ADJACENT ONES OF SAID LATERAL EDGES, AND SUCCESSIVELY WELDING TOGETHER SAID ADJACENT ONES OF SAID EDGES AT A PREDETERMINED WELDING POINT.
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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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |