US3535487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam welding apparatus
Assignee: AO Smith Corp
•
Filing: 1968-03-18
•
Granted: 1970-10-20
•
Expires: 1988-03-18
Abstract
No abstract record available.
Inventors
- 👤 John F Hinrichs
- 👤 Sigurd K Rudorf
- 👤 John P Berkeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:45
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/18; B; B23; B23K; B23K15/00; B23K15/0046
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1504088A
Cited
US3193657A
Cited
GB1045405A
Cited
US3401249A
Cited
US3275789A
Cited
US3264004A
Cited
US3391268A
Cited
US3426173A
Cited
US3389240A
Cited
US3440392A
Cited
US3437785A
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 |