Patent US2534617A successfully refreshed from Google Patents.
US2313889A
Expired / Lapsed
US
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Rotameter and the like
Assignee: Fischer and Porter Co
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Filing: 1941-08-22
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Granted: 1943-03-16
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Expires: 1961-08-22
Abstract
No abstract record available.
Inventors
- 👤 George K Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:09
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/22; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-03-15 | 1946-09-14 | 1947-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-03-15 | 1950-09-14 | 1951-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-03-15 | 1954-09-14 | 1955-03-16 | $7700.00 | Window Closed / Lapsed |