Patent US2520692A successfully refreshed from Google Patents.
US2520692A
Expired / Lapsed
US
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Gas and air mixing device
Assignee: Combustion Engineering Inc
•
Filing: 1946-02-15
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Granted: 1950-08-29
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Expires: 1966-02-15
Abstract
No abstract record available.
Inventors
- 👤 Elno M Powell
- 👤 Virginius Z Caracristi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:59
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/46; F23D14/60; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87587; Y10T137/87595
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) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |