US3550680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finned tube heat exchanger and method of making same
Assignee: Orbit Manufacturing Co
•
Filing: 1969-03-24
•
Granted: 1970-12-29
•
Expires: 1989-03-24
Abstract
No abstract record available.
Inventors
- 👤 Charles S Shriver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:50
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/30; F24; F24H; F24H3/00; F24H3/002; H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48; H05B3/50
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1973-12-28 | 1974-06-29 | 1974-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-28 | 1978-06-29 | 1978-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-28 | 1982-06-29 | 1982-12-29 | $7700.00 | Window Closed / Lapsed |