Patent US3903515A successfully refreshed from Google Patents.
US2680437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solar heat trap
Assignee: University of Nebraska System
•
Filing: 1945-12-03
•
Granted: 1954-06-08
•
Expires: 1965-12-03
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:20
CPC Classifications
F; F25; F25B; F25B27/00; F25B27/002; F24; F24S; F24S10/00; F24S10/25; F24S70/00; F24S70/60; F24S70/65; F24S80/00; F24S2080/03; F24S2080/05; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E10/44; Y10; Y10S; Y10S165/00; Y10S165/904
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US117476A
Cited
US172398A
Cited
US201439A
Cited
US229109A
Cited
US291146A
Cited
US412725A
Cited
US430762A
Cited
US659450A
Cited
US246626A
Cited
US681095A
Cited
US965391A
Cited
US984585A
Cited
US1056861A
Cited
US1158175A
Cited
US1814897A
Cited
DE503538C
Cited
GB325179A
Cited
US1880938A
Cited
US2207656A
Cited
US2469496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |