US2505521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Age indicating device for electrical apparatus
Assignee: General Electric Co
•
Filing: 1944-03-01
•
Granted: 1950-04-25
•
Expires: 1964-03-01
Abstract
No abstract record available.
Inventors
- 👤 Boyajian Aram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:09
CPC Classifications
G; G01; G01K; G01K3/00; G01K3/02; G01K3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE268517C
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GB190301541A
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US842981A
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US1043115A
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DE329610C
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DE355775C
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US1485013A
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US1618800A
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GB361586A
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US2222551A
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US2320310A
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US2320311A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |