US2253307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical circuit
Assignee: AO Smith Corp
•
Filing: 1938-02-18
•
Granted: 1941-08-19
•
Expires: 1958-02-18
Abstract
No abstract record available.
Inventors
- 👤 Richter Walther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:18
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/42
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) | 1944-08-18 | 1945-02-17 | 1945-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-18 | 1949-02-17 | 1949-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-18 | 1953-02-17 | 1953-08-19 | $7700.00 | Window Closed / Lapsed |