Patent US2820131A successfully refreshed from Google Patents.
US2820131A
Expired / Lapsed
US
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Curing oven
Assignee: Sprague Electric Co
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Filing: 1951-08-01
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Granted: 1958-01-14
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Expires: 1971-08-01
Abstract
No abstract record available.
Inventors
- 👤 George T Kodama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:32
CPC Classifications
F; F26; F26B; F26B15/00; F26B15/10; F26B15/12; F26B15/18; F26B3/00; F26B3/28; F26B3/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1526363A
Cited
US1623567A
Cited
US1880954A
Cited
US2204465A
Cited
US2221776A
Cited
US2353165A
Cited
US2321938A
Cited
US2354658A
Cited
US2340354A
Cited
US2441960A
Cited
US2402631A
Cited
GB579946A
Cited
US2558338A
Cited
US2624013A
Cited
US2582438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |