US2873353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding of helically formed tubing
Assignee: Magnetic Heating Corp
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Filing: 1955-11-30
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Granted: 1959-02-10
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Expires: 1975-11-30
Abstract
No abstract record available.
Inventors
- 👤 Wallace C Rudd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:06
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/08; B23K11/082; B23K11/084; B21; B21C; B21C37/00; B21C37/06; B21C37/12; B21C37/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US446974A
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US977711A
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US1278234A
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US1679702A
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US1865845A
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US2066668A
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US2139211A
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US2663784A
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FR1095095A
Cited
US2794108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |