Patent US2687464A successfully refreshed from Google Patents.
US2687464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency induction tube welding
Assignee: Individual
•
Filing: 1951-01-11
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Granted: 1954-08-24
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Expires: 1971-01-11
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:15
CPC Classifications
B; B23; B23K; B23K13/00; B23K13/01; B23K13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
GB377655A
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US2020276A
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US2086305A
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US2094920A
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US2205424A
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US2509713A
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US2433296A
Cited
GB616117A
Cited
US2496188A
Cited
US2582963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |