Patent US3449953A successfully refreshed from Google Patents.
US3449953A
Expired / Lapsed
US
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Fluid flow measuring equipment
Assignee: British Telecommunications Research Ltd
•
Filing: 1966-06-15
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Granted: 1969-06-17
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Expires: 1986-06-15
Abstract
No abstract record available.
Inventors
- 👤 David J Craft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:48
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/005; G; G01; G01F; G01F1/00; G01F1/68; G01P; G01P5/00; G01P5/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3236451A
Cited
US3326040A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |