Patent US2520591A successfully refreshed from Google Patents.
US2520591A
Expired / Lapsed
US
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Control cock for gaseous fuel burners burning a mixture of two gases
Assignee: Individual
•
Filing: 1946-04-09
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Granted: 1950-08-29
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Expires: 1966-04-09
Abstract
No abstract record available.
Inventors
- 👤 Harry T Wilmarth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:47
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/36; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/8593; Y10T137/86493; Y10T137/86558; Y10T137/86566; Y10T137/87153; Y10T137/87161; Y10T137/87571; Y10T137/87676; Y10T137/87684
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US320461A
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US395453A
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US574237A
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US757482A
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US1097264A
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US1222164A
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US1335922A
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US1948737A
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US2108299A
Cited
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 |