Patent US2511540A successfully refreshed from Google Patents.
US2511540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Room heater
Assignee: McGraw Electric Co
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Filing: 1946-08-24
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Granted: 1950-06-13
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Expires: 1966-08-24
Abstract
No abstract record available.
Inventors
- 👤 Clark M Osterheld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:58
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/342; H05B2203/00; H05B2203/014; H05B2203/015; H05B2203/017; H05B2203/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1192153A
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US1257339A
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US1416481A
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GB217950A
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US2025586A
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US2122522A
Cited
US2107598A
Cited
US2251697A
Cited
US2345300A
Cited
US2360267A
Cited
US2387995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |