Patent US2720259A successfully refreshed from Google Patents.
US2720259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas venting of heat exchangers
Assignee: Chicago Bridge and Iron Co
•
Filing: 1950-04-14
•
Granted: 1955-10-11
•
Expires: 1970-04-14
Abstract
No abstract record available.
Inventors
- 👤 Harold E Jacoby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:27
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F28D7/163; F28D7/1669; F22; F22D; F22D1/00; F22D1/32; F28F; F28F2265/00; F28F2265/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1049425A
Cited
US1399710A
Cited
US1586814A
Cited
US1622918A
Cited
US1638697A
Cited
US2090985A
Cited
US2204497A
Cited
US2350936A
Cited
US2544885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |