Patent US5337674A successfully refreshed from Google Patents.
Patent US3511268A successfully refreshed from Google Patents.
US3511268A
Expired / Lapsed
US
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Apparatus for varying the cross-sectional area of the throat of a venturi tube
Assignee: Universal Oil Products Co
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Filing: 1968-07-09
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Granted: 1970-05-12
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Expires: 1988-07-09
Abstract
No abstract record available.
Inventors
- 👤 Ricardo S Dubrovsky
- 👤 James P Tomany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:41
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/37; G01F1/372; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7759; Y10T137/776
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1969366A
Cited
US1981576A
Cited
US1934713A
Cited
US2467150A
Cited
US2877791A
Cited
US3441245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |