US2550152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage battery liquid level controller
Assignee: National Battery Co
•
Filing: 1949-10-26
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Granted: 1951-04-24
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Expires: 1969-10-26
Abstract
No abstract record available.
Inventors
- 👤 Henry A Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:20
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/30; G01F23/56; G01F23/58; H; H01; H01M; H01M50/00; H01M50/60; H01M50/609; H01M50/627; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |