US3460235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding of transition pieces
Assignee: Welding Institute England
•
Filing: 1964-04-16
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Granted: 1969-08-12
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Expires: 1984-04-16
Abstract
No abstract record available.
Inventors
- 👤 Thomas Marmaduke Roberts
- 👤 Peter Thomas Houldcroft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:52
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/12; B23K20/129; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
61 words
A METHOD OF FORMING A METALLIC TRANSITION PIECE OF A GIVEN SHAPE AND THICKNESS AND COMPRISING AT LEAST TWO METALS, INCLUDING THE STEPS OF BUTT WELDING A TUBE OF ONE METAL TO A TUBE OF ANOTHER METAL BY FRICTION WELDING AND THEREAFTER WORKING BY ROLLING THE FRICTION WELDED TUBE TO REDUCE ITS THICKNESS AND TO FORM A THIN-WALLED CYLINDICAL TRANSITION PIECE.
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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) | 1972-08-11 | 1973-02-10 | 1973-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-11 | 1977-02-10 | 1977-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-11 | 1981-02-10 | 1981-08-12 | $7700.00 | Window Closed / Lapsed |