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US2231457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical apparatus
Assignee: Individual
•
Filing: 1936-08-03
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Granted: 1941-02-11
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Expires: 1956-08-03
Abstract
No abstract record available.
Inventors
- 👤 John L Stephen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:14
CPC Classifications
F; F26; F26B; F26B3/00; F26B3/32; F26B3/34; F26B3/347; H; H05; H05B; H05B6/00; H05B6/46; H05B6/48; H05B6/50; Y; Y10; Y10S; Y10S65/00; Y10S65/04
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) | 1944-02-11 | 1944-08-12 | 1945-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-11 | 1948-08-12 | 1949-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-11 | 1952-08-12 | 1953-02-11 | $7700.00 | Window Closed / Lapsed |