US2251066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Individual
•
Filing: 1938-05-19
•
Granted: 1941-07-29
•
Expires: 1958-05-19
Abstract
No abstract record available.
Inventors
- 👤 Persson Ruben Alef
- 👤 Naucler Johan Olof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:56
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/08; F28F3/083; F28D; F28D9/00; F28D9/0012; F28D9/04; F28F3/02; F28F3/025; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/361
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-07-28 | 1945-01-27 | 1945-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-28 | 1949-01-27 | 1949-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-28 | 1953-01-27 | 1953-07-29 | $7700.00 | Window Closed / Lapsed |