US3256724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming helical, lock seam or welded pipe
Assignee: Armco Inc
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Filing: 1963-05-07
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Granted: 1966-06-21
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Expires: 1983-05-07
Abstract
No abstract record available.
Inventors
- 👤 Wiley Allen Dale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:36
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/12; B21C37/124
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
THE METHOD OF FREE-FORMING SPIRAL PIPE, WHICH INCLUDES THE STEPS OF MOVING A STRIP OF METAL LONGITUDINALLY THROUGH A BENDER DISPOSED AT AN ANGLE OF MORE THAN 90* TO THE PATH OF THE CENTERLINE OF SAID STRIP, WHEREBY TO IMPART TO SAID STRIP A HELICAL CONFIGURATION SUCH THAT AFTER THE FIRST HELICAL CONVOLUTION HAS BEEN FORMED THE OUTER EDGE OF SAID CONVOLUTION IN JUXTAPOSED TO THE INSIDE EDGE OF THE INCOMING STRIP, AND MAINTAINING CONSTANT THE DIAMETER OF THE
Claim 2
Independent Claim
79 words
THE METHOD OF FREE-FORMING SPIRAL PIPE, WHICH INCLUDES THE STEPS OF MOVING A STRIP OF METAL LONGITUDINALLY THROUGH A BENDER DISPOSED AT AN ANGLE OF MORE THAN 90* TO THE PATH OF THE CENTERLINE OF SAID STRIP, WHEREBY TO IMPART TO SAID STRIP A HELICAL CONFIGURATION SUCH THAT AFTER THE FIRST HELICAL CONVOLUTION HAS BEEN FORMED THE OUTER EDGE OF SAID CONVOLUTION IN JUXTAPOSED TO THE INSIDE EDGE OF THE INCOMING STRIP, AND MAINTAINING CONSTANT THE DIAMETER OF THE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |