US2553977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proportioning device
Assignee: Johnson March Corp
•
Filing: 1948-02-12
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Granted: 1951-05-22
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Expires: 1968-02-12
Abstract
No abstract record available.
Inventors
- 👤 George A Mau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:41
CPC Classifications
G; G05; G05D; G05D11/00; G05D11/02; G05D11/03; C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/687; Y; Y10; Y10T; Y10T137/00; Y10T137/4891; Y10T137/7287; Y10T137/7313; Y10T137/7722; Y10T137/7837; Y10T137/7898; Y10T137/7903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |