US2456455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Servel Inc
•
Filing: 1944-10-17
•
Granted: 1948-12-14
•
Expires: 1964-10-17
Abstract
No abstract record available.
Inventors
- 👤 Walter M Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:09
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/027; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/373; Y10S165/384
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE264945C
Cited
US1272925A
Cited
US1576410A
Cited
US1740145A
Cited
GB527585A
Cited
US2361691A
Cited
US2287281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |