US2553073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solar heater with spaced parallel heat absorbing sheets
Assignee: Individual
•
Filing: 1947-11-12
•
Granted: 1951-05-15
•
Expires: 1967-11-12
Abstract
No abstract record available.
Inventors
- 👤 Barnett Roy Everett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:15
CPC Classifications
F; F24; F24S; F24S10/00; F24S10/30; F24S50/00; F24S50/40; F24S70/00; F24S70/60; F24S70/65; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E10/44
Claims Analysis
Total Claims: 0
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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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |