US2047254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine and method for electrically welding tubes
Assignee: Spang Chalfont & Co Inc
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Filing: 1931-10-07
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Granted: 1936-07-14
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Expires: 1951-10-07
Abstract
No abstract record available.
Inventors
- 👤 Howard J Burnish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:23
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/06; B23K11/061; B23K11/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-07-14 | 1940-01-13 | 1940-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-07-14 | 1944-01-13 | 1944-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-07-14 | 1948-01-13 | 1948-07-14 | $7700.00 | Window Closed / Lapsed |