US2428876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-conditioning system for cooling or heating
Assignee: Individual
•
Filing: 1944-07-10
•
Granted: 1947-10-14
•
Expires: 1964-07-10
Abstract
No abstract record available.
Inventors
- 👤 Reginald R Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:29
CPC Classifications
F; F28; F28D; F28D20/00; F28D20/0052; F24; F24D; F24D11/00; F24D11/02; F24F; F24F5/00; F24F5/0046; F24S; F24S90/00; F24V; F24V50/00; F25; F25B; F25B13/00; F28F; F28F1/00; F28F1/10; F28F1/12; F28F9/00; F28F9/007; F28F9/013; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y02E60/00; Y02E60/14; Y10; Y10S; Y10S203/00; Y10S203/01; Y10S62/00; Y10S62/01
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US82651A
Cited
US1875305A
Cited
FR487762A
Cited
DE342377C
Cited
US1969187A
Cited
US1891713A
Cited
FR763867A
Cited
US2105383A
Cited
US2323264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |