Patent US2345638A successfully refreshed from Google Patents.
US2345638A
Expired / Lapsed
US
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Enclosed arc device and controlling means for service at varying intensities
Assignee: INST DIVI THOMAE FOUNDATION
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Filing: 1941-05-03
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Granted: 1944-04-04
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Expires: 1961-05-03
Abstract
No abstract record available.
Inventors
- 👤 George S Sperti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:49
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/40; H05B41/42; H01; H01J; H01J61/00; H01J61/02; H01J61/54; H01J61/545; Y; Y10; Y10S; Y10S125/00; Y10S125/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-04-04 | 1947-10-04 | 1948-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-04-04 | 1951-10-04 | 1952-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-04-04 | 1955-10-04 | 1956-04-04 | $7700.00 | Window Closed / Lapsed |