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US2882023A
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Heat economizer for small units
Assignee: HOME HEATING DEVICES Inc
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Filing: 1955-11-30
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Granted: 1959-04-14
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Expires: 1975-11-30
Abstract
No abstract record available.
Inventors
- 👤 Salvatore F Rizzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:49
CPC Classifications
F; F24; F24B; F24B7/00; F24B7/005; F22; F22D; F22D1/00; F22D1/006; F22D1/02; Y; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US518864A
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US2104804A
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US1292615A
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US2032553A
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US2147658A
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US2575894A
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US2693941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |