Patent US2848809A successfully refreshed from Google Patents.
Patent US2640180A successfully refreshed from Google Patents.
US2640180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding apparatus
Assignee: Westinghouse Electric Corp
•
Filing: 1948-04-02
•
Granted: 1953-05-26
•
Expires: 1968-04-02
Abstract
No abstract record available.
Inventors
- 👤 John R Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:01
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/248
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1830232A
Cited
US2295601A
Cited
US2404918A
Cited
US2307447A
Cited
US2356859A
Cited
US2385214A
Cited
US2402432A
Cited
US2431083A
Cited
US2464287A
Cited
US2472507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |