Patent US2429451A successfully refreshed from Google Patents.
US2429451A
Expired / Lapsed
US
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Control system with gas discharge tube
Assignee: PHOTOSWITCH Inc
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Filing: 1944-11-16
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Granted: 1947-10-21
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Expires: 1964-11-16
Abstract
No abstract record available.
Inventors
- 👤 Phillip J Cade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:36
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/08; F23N5/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2071958A
Cited
US1996556A
Cited
US2020917A
Cited
US2317783A
Cited
US2352240A
Cited
US2358432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-20 | 1951-04-21 | 1951-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-20 | 1955-04-21 | 1955-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-20 | 1959-04-21 | 1959-10-21 | $7700.00 | Window Closed / Lapsed |