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Patent US2993978A successfully refreshed from Google Patents.
US2993978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Baseboard heater
Assignee: Markel Electric Products Inc
•
Filing: 1958-09-19
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Granted: 1961-07-25
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Expires: 1978-09-19
Abstract
No abstract record available.
Inventors
- 👤 Morris L Markel
- 👤 Grant Cuthbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:24
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2855186A
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US2872162A
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US2861167A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |