US3093103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing spiral pipe
Assignee: Individual
•
Filing: 1958-02-10
•
Granted: 1963-06-11
•
Expires: 1978-02-10
Abstract
No abstract record available.
Inventors
- 👤 Florence B Berkeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:53
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/12; B21C37/127
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE METHOD OF FORMING METAL TUBE FROM A HELICALLY WOUND ELONGATED STEEL STRIP COMPRISING THE STEPS OF IMPARTING TO A LONGITUDINALLY MOVING STEEL STRIP DIAGONALLY OF ITS LONGITUDINAL AXIS AN INITIAL CURVATURE OF A SLIGHTLY GREATER RADIUS THAN THE RADIUS OF THE TUBE TO BE FORMED; FORMING SIAD CURVED STRIP HELICALLY INTO CONVOLUTIONS TO FORM A TUBE WHILE CONFINING SAID STRIP TO A RADIUS OF CURVATURE WHICH IS SLIGHTLY LESS THAN THE INITIAL RADIUS OF CURVATURE IMPARTED TO SAID STRIP, WHICH INHERENTLY CHANGES THE STEEL TOITS SO-CALLED PLASTIC STATE, SAID TUBE BEING MOVED LONGITUDINALLY OF ITS AXIS BY THE FORCE OF SAID MOVING STRIP; APPLYING RESISTANCE TO THE LONGITUDINAL MOVEMENT OF SAID CURVED STRIP SUFFICIENT TO CAUSE ABUTMENT OF THE EDGES IN THE PLASTIC STATE OF SAID CONVOLUTIONS OF THE TUBE; AND CONTINUOUSLY WELDING TOGETHER THE ABUTTING EDGES.
Claim 2
Independent Claim
138 words
THE METHOD OF FORMING METAL TUBE FROM A HELICALLY WOUND ELONGATED STEEL STRIP COMPRISING THE STEPS OF IMPARTING TO A LONGITUDINALLY MOVING STEEL STRIP DIAGONALLY OF ITS LONGITUDINAL AXIS AN INITIAL CURVATURE OF A SLIGHTLY GREATER RADIUS THAN THE RADIUS OF THE TUBE TO BE FORMED; FORMING SIAD CURVED STRIP HELICALLY INTO CONVOLUTIONS TO FORM A TUBE WHILE CONFINING SAID STRIP TO A RADIUS OF CURVATURE WHICH IS SLIGHTLY LESS THAN THE INITIAL RADIUS OF CURVATURE IMPARTED TO SAID STRIP, WHICH INHERENTLY CHANGES THE STEEL TOITS SO-CALLED PLASTIC STATE, SAID TUBE BEING MOVED LONGITUDINALLY OF ITS AXIS BY THE FORCE OF SAID MOVING STRIP; APPLYING RESISTANCE TO THE LONGITUDINAL MOVEMENT OF SAID CURVED STRIP SUFFICIENT TO CAUSE ABUTMENT OF THE EDGES IN THE PLASTIC STATE OF SAID CONVOLUTIONS OF THE TUBE; AND CONTINUOUSLY WELDING TOGETHER THE ABUTTING EDGES.
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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) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |