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US2749935A
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Oil burner by-pass valve
Assignee: WOODROW H KRATZ
•
Filing: 1953-07-29
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Granted: 1956-06-12
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Expires: 1973-07-29
Abstract
No abstract record available.
Inventors
- 👤 Charles B Heard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:05
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/0473; F16K17/044; F23; F23D; F23D11/00; F23D11/24; F23D11/26; F23D11/28; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2612; Y10T137/7722; Y10T137/7781; Y10T137/7834
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1998223A
Cited
GB641327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |