Patent US2709576A successfully refreshed from Google Patents.
US2709576A
Expired / Lapsed
US
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Casing structure for baseboard heaters
Assignee: Individual
•
Filing: 1952-05-05
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Granted: 1955-05-31
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Expires: 1972-05-05
Abstract
No abstract record available.
Inventors
- 👤 Harry N Marggraf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:32
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/02; F24D19/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2018236A
Cited
US1914196A
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US2269578A
Cited
US2516871A
Cited
US2487287A
Cited
US2568818A
Cited
US2651504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |