US2445920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined building structure and heating system
Assignee: Individual
•
Filing: 1944-02-22
•
Granted: 1948-07-27
•
Expires: 1964-02-22
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:49
CPC Classifications
F; F24; F24D; F24D5/00; F24D5/02; F24D5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2235607A
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CH32761A
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FR615450A
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US1983023A
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US2160132A
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US2107523A
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US2182686A
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US2210960A
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US2306034A
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US2237831A
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US2277247A
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US2302818A
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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) | 1951-07-27 | 1952-01-26 | 1952-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-27 | 1956-01-26 | 1956-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-27 | 1960-01-26 | 1960-07-27 | $7700.00 | Window Closed / Lapsed |