US2439775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Schneider Electric Buildings Americas Inc
•
Filing: 1944-06-17
•
Granted: 1948-04-13
•
Expires: 1964-06-17
Abstract
No abstract record available.
Inventors
- 👤 Walter W Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:53
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F01; F01P; F01P3/00; F01P3/18; F04D29/00; F04D29/40; F04D29/52; F04D29/54; F04D29/541; F04D29/545; F28; F28D; F28D1/00; F28D1/02; F28F; F28F1/00; F28F1/02; F28F2250/00; F28F2250/02; Y; Y10; Y10S; Y10S165/00; Y10S165/228; Y10S165/302; Y10S165/311; Y10S165/313
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB139750A
Cited
US1688158A
Cited
US1893650A
Cited
US2096272A
Cited
US2078766A
Cited
FR815859A
Cited
US2144631A
Cited
US2171817A
Cited
US2270665A
Cited
US2289163A
Cited
US2346178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |