US3292408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming internally ribbed tubes
Assignee: Babcock and Wilcox Co
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Filing: 1964-06-22
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Granted: 1966-12-20
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Expires: 1984-06-22
Abstract
No abstract record available.
Inventors
- 👤 John R Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:12
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21C37/207
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
THE METHOD OF FORMING INTERNAL HELICAL RIBBING IN AN ELONGATED TUBE INCLUDING THE STEPS OF: FORMING AN INTERNAL HELICAL GROOVE OF ASYMMETRICAL PROFILE IN SAID TUBE, WITH ONE SIDE OF THE SURFACE OF SAID GROOVE MAKING AN ANGLE IN PROFILE OF IN THE RANGE OF BETWEEN 5* AND 10* TO THE LONGITUDINAL AXIS OF THE TUBE BY PLACING THE TUBE OVER A FORMING ROD HAVING ON ITS SURFACE THE CONVERSE OF THE CONFIGURATION TO BE IMPARTED TO THE TUBE AND THEN DRAWING THE ROD CARRYING THE TUBE THROUGH A DIE TO THEREBY CAUSE THE INTERNAL SURFACE OF THE TUBE TO ASSUME THE SHAPE OF THE ROD SURFACE, ROLLING THE WALL OF SAID TUBE AGAINST SAID ROD TO THEREBY INCREASE THE CLEARANCE BETWEEN SAID ROD AND SAID TUBE, AND ROTATING THE ROD RELATIVE TO THE TUBE TO REMOVE SAID ROD FROM THE TUBE.
Claim 2
Independent Claim
142 words
THE METHOD OF FORMING INTERNAL HELICAL RIBBING IN AN ELONGATED TUBE INCLUDING THE STEPS OF: FORMING AN INTERNAL HELICAL GROOVE OF ASYMMETRICAL PROFILE IN SAID TUBE, WITH ONE SIDE OF THE SURFACE OF SAID GROOVE MAKING AN ANGLE IN PROFILE OF IN THE RANGE OF BETWEEN 5* AND 10* TO THE LONGITUDINAL AXIS OF THE TUBE BY PLACING THE TUBE OVER A FORMING ROD HAVING ON ITS SURFACE THE CONVERSE OF THE CONFIGURATION TO BE IMPARTED TO THE TUBE AND THEN DRAWING THE ROD CARRYING THE TUBE THROUGH A DIE TO THEREBY CAUSE THE INTERNAL SURFACE OF THE TUBE TO ASSUME THE SHAPE OF THE ROD SURFACE, ROLLING THE WALL OF SAID TUBE AGAINST SAID ROD TO THEREBY INCREASE THE CLEARANCE BETWEEN SAID ROD AND SAID TUBE, AND ROTATING THE ROD RELATIVE TO THE TUBE TO REMOVE SAID ROD FROM THE TUBE.
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) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |