US2443252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure operated rheostat
Assignee: Thomas A Edison Inc
•
Filing: 1944-11-02
•
Granted: 1948-06-15
•
Expires: 1964-11-02
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:24
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/06; G01L19/0609; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/188; Y10T74/18808; Y10T74/18816
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2283378A
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US2248047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-15 | 1951-12-15 | 1952-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-15 | 1955-12-15 | 1956-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-15 | 1959-12-15 | 1960-06-15 | $7700.00 | Window Closed / Lapsed |