US2517869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for heating articles
Assignee: A E GRAPP AND NORTHWESTERN NAT
•
Filing: 1944-05-18
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Granted: 1950-08-08
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Expires: 1964-05-18
Abstract
No abstract record available.
Inventors
- 👤 Albert E Grapp And North Natio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:16
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/025; F27; F27D; F27D19/00; F23N2233/00; F23N2233/02; F27D2019/0028; F27D2019/0031; F27D2019/0034
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1391996A
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US1650889A
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US1731315A
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US1977216A
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US2051401A
Cited
US2046718A
Cited
US2133673A
Cited
US2282489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-07 | 1954-02-06 | 1954-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-07 | 1958-02-06 | 1958-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-07 | 1962-02-06 | 1962-08-08 | $7700.00 | Window Closed / Lapsed |