Patent US2809799A successfully refreshed from Google Patents.
US2809799A
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High pressure oil valve for returnflow burners
Assignee: Hagan Chemicals and Controls Inc
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Filing: 1954-08-12
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Granted: 1957-10-15
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Expires: 1974-08-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Edwin A Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:08
CPC Classifications
F; F16; F16K; F16K47/00; F16K47/02; F16K47/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US681611A
Cited
US1184563A
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US2059808A
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US2416722A
Cited
GB645953A
Cited
US2640356A
Cited
US2680454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |