US2671441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable heat insulating apparatus and solar heating system comprising same
Assignee: Individual
•
Filing: 1948-09-10
•
Granted: 1954-03-09
•
Expires: 1968-09-10
Abstract
No abstract record available.
Inventors
- 👤 Clyde W Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:22
CPC Classifications
F; F24; F24S; F24S50/00; F24S60/00; F28; F28F; F28F13/00; F28F2013/005; F28F2013/008; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y10; Y10S; Y10S165/00; Y10S165/904; Y10S62/00; Y10S62/01
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) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |