US2828947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Svenska Flaktfabriken AB
•
Filing: 1954-11-10
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Granted: 1958-04-01
•
Expires: 1974-11-10
Abstract
No abstract record available.
Inventors
- 👤 Hedbom Lars
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:01
CPC Classifications
F; F24; F24F; F24F12/00; F24F12/001; Y; Y02; Y02B; Y02B30/00; Y02B30/56; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/373
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US765857A
Cited
US1409967A
Cited
US1597678A
Cited
US1750850A
Cited
US1761173A
Cited
US2143269A
Cited
US2064928A
Cited
US2728561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |