Patent US2425720A successfully refreshed from Google Patents.
US2425720A
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Compound meter
Assignee: Rockwell Manufacturing Co
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Filing: 1943-11-04
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Granted: 1947-08-19
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Expires: 1963-11-04
Abstract
No abstract record available.
Inventors
- 👤 Charles P Bergman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:11
CPC Classifications
G; G01; G01F; G01F7/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7898; Y10T137/7903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US934504A
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US1142141A
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US1576712A
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GB304837A
Cited
DE541726C
Cited
US2270141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-18 | 1951-02-17 | 1951-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-18 | 1955-02-17 | 1955-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-18 | 1959-02-17 | 1959-08-19 | $7700.00 | Window Closed / Lapsed |