US3535489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam welding apparatus
Assignee: AO Smith Corp
•
Filing: 1968-05-03
•
Granted: 1970-10-20
•
Expires: 1988-05-03
Abstract
No abstract record available.
Inventors
- 👤 John F Hinrichs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:47
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/18; B; B23; B23K; B23K15/00; B23K15/06; H01J37/30; H01J37/3002; H01J37/3007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3151231A
Cited
US3136882A
Cited
US3136883A
Cited
US3301993A
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US3183563A
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US3351731A
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US3325620A
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US3219792A
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US3258576A
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US3264004A
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US3391268A
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US3426173A
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US3389240A
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US3430029A
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US3441709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |