US3434532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger for waste heat recovery
Assignee: Individual
•
Filing: 1967-03-23
•
Granted: 1969-03-25
•
Expires: 1987-03-23
Abstract
No abstract record available.
Inventors
- 👤 Per Henriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:54
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062; F22; F22B; F22B1/00; F22B1/02; F22B1/18; F22B1/1869; F28F; F28F3/00; F28F3/02; F28F3/022; F28F2250/00; F28F2250/10; F28F2250/104
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1818402A
Cited
US1576410A
Cited
US1958899A
Cited
CH210669A
Cited
US2395543A
Cited
GB579468A
Cited
US2875986A
Cited
FR1215858A
Cited
US3168073A
Cited
US3323495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |