Patent US3266285A successfully refreshed from Google Patents.
US3266285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of tubing
Assignee: Individual
•
Filing: 1963-01-25
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Granted: 1966-08-16
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Expires: 1983-01-25
Abstract
No abstract record available.
Inventors
- 👤 Jensen Erling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:40
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/02; B21D22/025; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/155
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD OF CONVERTING CIRCULAR SECTION SHEET METAL TUBING INTO NON-CIRCULAR SECTION TUBING, WHICH COMPRISES THE STEPS OF: EFFECTING AN INITIAL FLATTENING OF THE TUBING, LOCATING THE INITIALLY FLATTENED TUBING UPON AN EXPANSIBLE MANDREL WITH SAID MANDREL EXTENDING INSIDE THE TUBING THROUGHOUT THE ENTIRE LENGTH OF THE TUBING, DEFORMING THE TUBING FURTHER INTO THE DESIRED NON-CIRCULAR CROSS-SECTION BY EXPANDING SAID MANDREL UNIFORMLY THROUGHOUT THE LENGTH OF THE TUBING, RESTORING THE MANDREL TO RELEASE THE TUBING AND SEPARATING THE TUBING FROM THE RESTORED MANDREL BY EFFECTING RELATIVE AXIAL MOVEMENT BETWEEN THE TUBING AND THE MANDREL.
Claim 2
Independent Claim
94 words
A METHOD OF CONVERTING CIRCULAR SECTION SHEET METAL TUBING INTO NON-CIRCULAR SECTION TUBING, WHICH COMPRISES THE STEPS OF: EFFECTING AN INITIAL FLATTENING OF THE TUBING, LOCATING THE INITIALLY FLATTENED TUBING UPON AN EXPANSIBLE MANDREL WITH SAID MANDREL EXTENDING INSIDE THE TUBING THROUGHOUT THE ENTIRE LENGTH OF THE TUBING, DEFORMING THE TUBING FURTHER INTO THE DESIRED NON-CIRCULAR CROSS-SECTION BY EXPANDING SAID MANDREL UNIFORMLY THROUGHOUT THE LENGTH OF THE TUBING, RESTORING THE MANDREL TO RELEASE THE TUBING AND SEPARATING THE TUBING FROM THE RESTORED MANDREL BY EFFECTING RELATIVE AXIAL MOVEMENT BETWEEN THE TUBING AND THE MANDREL.
References Cited (Backward Citations)
US2057359A
Cited
US2916076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |