US3305665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forced circulation electric heater employing cross-flow type fan
Assignee: LAING VORTEX Inc
•
Filing: 1965-08-16
•
Granted: 1967-02-21
•
Expires: 1985-08-16
Abstract
No abstract record available.
Inventors
- 👤 Laing Nikolaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:35
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; F24H3/0411; F24H3/0417
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1626400A
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US1679841A
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US1823579A
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US1920952A
Cited
US2458268A
Cited
GB757543A
Cited
US3035760A
Cited
US2822674A
Cited
US2988626A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |