US2430719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant level device
Assignee: AUTOMATIC PRODUCTS CO
•
Filing: 1943-09-06
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Granted: 1947-11-11
•
Expires: 1963-09-06
Abstract
No abstract record available.
Inventors
- 👤 Roy W Johnson
- 👤 Lourdes V Mccarty
- 👤 Vernon R Pawelsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:09
CPC Classifications
F; F23; F23D; F23D5/00; F23D5/12; F23D5/14; F02; F02M; F02M5/00; F02M5/02; F24; F24C; F24C5/00; F24C5/16; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0777; Y10T137/7287; Y10T137/7358; Y10T137/7439
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2586A
Cited
US913354A
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US1259415A
Cited
FR525394A
Cited
GB162242A
Cited
US1784864A
Cited
US2068138A
Cited
US2197262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-10 | 1951-05-12 | 1951-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-10 | 1955-05-12 | 1955-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-10 | 1959-05-12 | 1959-11-11 | $7700.00 | Window Closed / Lapsed |