Patent US2790042A successfully refreshed from Google Patents.
US2790042A
Expired / Lapsed
US
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Control devices
Assignee: Drying Systems Inc
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Filing: 1955-10-12
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Granted: 1957-04-23
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Expires: 1975-10-12
Abstract
No abstract record available.
Inventors
- 👤 Samuel R Porwancher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:47
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2214092A
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US2244373A
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US2259973A
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US2348950A
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US2499040A
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US2526315A
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US2583814A
Cited
US2577104A
Cited
US2716228A
Cited
US2740858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |