US2572295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controller for electric systems
Assignee: Ritter Co Inc
•
Filing: 1947-03-20
•
Granted: 1951-10-23
•
Expires: 1967-03-20
Abstract
No abstract record available.
Inventors
- 👤 Eugene R Ziegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:16
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/06; H01H; H01H9/00; H01H9/0005; H02; H02P; H02P7/00; H02P7/06; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18856; Y10T74/1888
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US675293A
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US653725A
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US673911A
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US738870A
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US763031A
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US806735A
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US969055A
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US1111178A
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US1460161A
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DE459217C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |