US2814950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow indicator for filter apparatus
Assignee: Individual
•
Filing: 1955-04-20
•
Granted: 1957-12-03
•
Expires: 1975-04-20
Abstract
No abstract record available.
Inventors
- 👤 Joseph P Lawlor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:36
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE242038C
Cited
FR965825A
Cited
US768014A
Cited
US2028273A
Cited
FR797070A
Cited
US2283906A
Cited
US2336209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |