Patent US1669063A successfully refreshed from Google Patents.
US2931891A
Expired / Lapsed
US
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Wire preheating device
Assignee: WALCO ELECTRIC CO
•
Filing: 1957-07-05
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Granted: 1960-04-05
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Expires: 1977-07-05
Abstract
No abstract record available.
Inventors
- 👤 Edmund I Waldman
- 👤 Santos Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:47
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/06; B29C48/05; B29C48/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2432801A
Cited
US2415027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |