Patent US2402326A successfully refreshed from Google Patents.
US2402326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solar heater
Assignee: Individual
•
Filing: 1944-09-22
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Granted: 1946-06-18
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Expires: 1964-09-22
Abstract
No abstract record available.
Inventors
- 👤 William J Harkness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:18
CPC Classifications
F; F24; F24S; F24S10/00; F24S10/40; F24S10/70; F24S10/75; F24S10/754; F24S60/00; F24S60/30; F24S20/00; F24S2020/10; F24S2020/18; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E10/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-06-17 | 1949-12-17 | 1950-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-06-17 | 1953-12-17 | 1954-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-06-17 | 1957-12-17 | 1958-06-18 | $7700.00 | Window Closed / Lapsed |