Patent US2731380A successfully refreshed from Google Patents.
Patent US2980404A successfully refreshed from Google Patents.
US2980404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange device
Assignee: Union Carbide Corp
•
Filing: 1957-11-07
•
Granted: 1961-04-18
•
Expires: 1977-11-07
Abstract
No abstract record available.
Inventors
- 👤 Carl P Andersen
- 👤 John C Richardson
- 👤 Vincent E First
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:08
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/007; F28F9/013; F28F9/0132; F28D; F28D7/00; F28D7/02; F28D7/024
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2371107A
Cited
US962427A
Cited
US1366957A
Cited
US1500895A
Cited
US1633975A
Cited
US1840940A
Cited
US1799081A
Cited
US1821754A
Cited
US1915352A
Cited
US2160689A
Cited
US2287066A
Cited
US2373038A
Cited
US2508247A
Cited
US2530519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |