US2659800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating element
Assignee: McGraw Electric Co
•
Filing: 1950-09-20
•
Granted: 1953-11-17
•
Expires: 1970-09-20
Abstract
No abstract record available.
Inventors
- 👤 Waldo H Zander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:50
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189900416A
Cited
US1005360A
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US1652745A
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GB425043A
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US2102302A
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US2061516A
Cited
US2419355A
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US2363169A
Cited
US2464147A
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US2559077A
Cited
US2576632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |