Patent US2573035A successfully refreshed from Google Patents.
US2573035A
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US
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Electronic level control
Assignee: PHOTOSWITCH Inc
•
Filing: 1944-07-29
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Granted: 1951-10-30
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Expires: 1964-07-29
Abstract
No abstract record available.
Inventors
- 👤 John A Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:26
CPC Classifications
F; F22; F22D; F22D5/00; F22D5/24; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2511; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1979127A
Cited
US2078479A
Cited
US2202197A
Cited
US2385161A
Cited
US2357371A
Cited
US2358433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |