Patent US3213525A successfully refreshed from Google Patents.
US3213525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming an internal rib in the bore of a tube
Assignee: Babcock and Wilcox Co
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Filing: 1961-02-10
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Granted: 1965-10-26
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Expires: 1981-02-10
Abstract
No abstract record available.
Inventors
- 👤 William M Creighton
- 👤 Sidley O Evans
- 👤 Addison E Mcmurdy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:56
CPC Classifications
B; B23; B23D; B23D43/00; B23D43/005; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21C37/207; B23C; B23C3/00; B23C3/28; B23C3/32; B23G; B23G1/00; B23G1/22; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49384; Y10T29/49385; Y10T29/49387; Y10T29/49995; Y10T409/00; Y10T409/50; Y10T409/50082; Y10T409/502624; Y10T409/502788; Y10T409/502952
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD OF FORMING A SMALL DIAMETER RIBBED THE HAVING A SELECTED PITCH BETWEEN HELICAL TURNS OF THE RIBS WHICH COMRPRISES THE STEP OF FORMING A HELICAL GROOVE IN AN OVERSIZED TUBE HAVING AN INTERNAL DIAMETER GREATER THAN THE INTERNAL DIAMETER OF THE DESIRED RIBBED TUBE, THE STEP OF REGULATING THE FORMED DEPT OF SAID HELICAL GROOVE TO SUBSTANTIALLY THE SAME DEPTH AS THE DESIRED HEIGHT OF THE RIB IN SAID DESIRED RIBBED TUBE, AND THE STEP OF DRAWING SAID OVERSIZED TUBE TO REDUCE THE EXTERNAL AND INTERNAL DIAMETER OF THE SAID TUBE WHILE SUBSTANTIALLY MAINTAINING THE TUBE WALL THICKNESS, SAID TUBE DRAWING STEP INCREASING THE PITCH OF SAID FORMED GROOVE IN RELATIONSHIP TO REDUCTION OF TUBE DIAMETER.
Claim 2
Independent Claim
118 words
A METHOD OF FORMING A SMALL DIAMETER RIBBED THE HAVING A SELECTED PITCH BETWEEN HELICAL TURNS OF THE RIBS WHICH COMRPRISES THE STEP OF FORMING A HELICAL GROOVE IN AN OVERSIZED TUBE HAVING AN INTERNAL DIAMETER GREATER THAN THE INTERNAL DIAMETER OF THE DESIRED RIBBED TUBE, THE STEP OF REGULATING THE FORMED DEPT OF SAID HELICAL GROOVE TO SUBSTANTIALLY THE SAME DEPTH AS THE DESIRED HEIGHT OF THE RIB IN SAID DESIRED RIBBED TUBE, AND THE STEP OF DRAWING SAID OVERSIZED TUBE TO REDUCE THE EXTERNAL AND INTERNAL DIAMETER OF THE SAID TUBE WHILE SUBSTANTIALLY MAINTAINING THE TUBE WALL THICKNESS, SAID TUBE DRAWING STEP INCREASING THE PITCH OF SAID FORMED GROOVE IN RELATIONSHIP TO REDUCTION OF TUBE DIAMETER.
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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) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |