US3369209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating element
Assignee: Individual
•
Filing: 1965-02-05
•
Granted: 1968-02-13
•
Expires: 1985-02-05
Abstract
No abstract record available.
Inventors
- 👤 Edwin Bjorn
- 👤 Hegbom Thor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:24
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1763117A
Cited
US2280515A
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US2280516A
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US2036788A
Cited
US2360267A
Cited
US2703355A
Cited
US2975262A
Cited
US2767288A
Cited
US2816200A
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US3201738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |