US3473348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Individual
•
Filing: 1967-03-31
•
Granted: 1969-10-21
•
Expires: 1987-03-31
Abstract
No abstract record available.
Inventors
- 👤 Edward W Bottum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:12
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/40; F25; F25B; F25B15/00; F25B15/10; F25B40/00; F28D; F28D7/00; F28D7/10; F28D7/103; F28F13/00; F28F13/06; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2091119A
Cited
US2135235A
Cited
US2503595A
Cited
US2698162A
Cited
US2797554A
Cited
US2847193A
Cited
GB911987A
Cited
GB977455A
Cited
DE1208314B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |