Patent US2684231A successfully refreshed from Google Patents.
US2684231A
Expired / Lapsed
US
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Gas ejector
Assignee: Individual
•
Filing: 1952-02-25
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Granted: 1954-07-20
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Expires: 1972-02-25
Abstract
No abstract record available.
Inventors
- 👤 Edmund S Pomykala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:00
CPC Classifications
F; F28; F28B; F28B3/00; F28B3/04; Y; Y10; Y10S; Y10S261/00; Y10S261/10
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) | 1957-07-19 | 1958-01-18 | 1958-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-19 | 1962-01-18 | 1962-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-19 | 1966-01-18 | 1966-07-20 | $7700.00 | Window Closed / Lapsed |