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Patent US2728225A successfully refreshed from Google Patents.
US2728225A
Expired / Lapsed
US
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Thermal flowmeter
Assignee: Individual
•
Filing: 1953-03-12
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Granted: 1955-12-27
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Expires: 1973-03-12
Abstract
No abstract record available.
Inventors
- 👤 Herbert E Skibitzke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:53
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/68; E; E21; E21B; E21B47/00; E21B47/10; E21B47/103
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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |