US2672155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level indicating, recording, and controlling apparatus
Assignee: Individual
•
Filing: 1946-05-21
•
Granted: 1954-03-16
•
Expires: 1966-05-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:51
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/12; G01; G01F; G01F23/00; G01F23/30; G01F23/40; G01F23/44; G01F23/56; G01F23/60; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7368
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1406377A
Cited
US1664265A
Cited
US1695701A
Cited
US1954142A
Cited
US2015967A
Cited
GB409102A
Cited
US2056287A
Cited
US2203472A
Cited
US2426930A
Cited
US2394220A
Cited
US2520797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |