Patent US3091848A successfully refreshed from Google Patents.
US3091848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making multi-walled tubing
Assignee: Motors Liquidation Co
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Filing: 1958-09-18
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Granted: 1963-06-04
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Expires: 1978-09-18
Abstract
No abstract record available.
Inventors
- 👤 Bernard E Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:42
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/09; B21C37/15; B21C37/154
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
26 words
A METHOD OF MAKING MULTI-WALLED STEEL TUBING HAVING CONCENTRIC WALLS BRAZED TO ONE ANOTHER AND A WELDED OUTER SEAM, SAID METHOD COMPRISING SCARFING THE EDGES OF
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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) | 1966-06-03 | 1966-12-03 | 1967-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-03 | 1970-12-03 | 1971-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-03 | 1974-12-03 | 1975-06-04 | $7700.00 | Window Closed / Lapsed |