US2972299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable velocity diffuser
Assignee: Interchemical Corp
•
Filing: 1956-08-21
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Granted: 1961-02-21
•
Expires: 1976-08-21
Abstract
No abstract record available.
Inventors
- 👤 Marchi Vincent S De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:14
CPC Classifications
B; B41; B41F; B41F13/00; Y; Y10; Y10T; Y10T137/00; Y10T137/9464
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1837702A
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US2101202A
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US2274166A
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US2546793A
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US2473933A
Cited
US2676536A
Cited
US2821133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-21 | 1964-08-22 | 1965-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-21 | 1968-08-22 | 1969-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-21 | 1972-08-22 | 1973-02-21 | $7700.00 | Window Closed / Lapsed |