US2481882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sight glass fluid flow indicator
Assignee: Worthington Pump and Machinery Corp
•
Filing: 1945-11-20
•
Granted: 1949-09-13
•
Expires: 1965-11-20
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Sebald
- 👤 Hay William H De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:29
CPC Classifications
G; G01; G01P; G01P13/00; G01P13/008; F; F16; F16L; F16L2101/00; F16L2101/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US572724A
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US762485A
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US817470A
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US942139A
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US1110023A
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US1093229A
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US1257824A
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GB189322A
Cited
US2145304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |