US2904013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Babcock and Wilcox Co
•
Filing: 1954-05-06
•
Granted: 1959-09-15
•
Expires: 1974-05-06
Abstract
No abstract record available.
Inventors
- 👤 David K Davies
- 👤 Earl E Schoessow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:31
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/32; F22G; F22G1/00; F22G1/005
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US135181A
Cited
US1270621A
Cited
US1619034A
Cited
US1582407A
Cited
US1840305A
Cited
US1941480A
Cited
US2033185A
Cited
US1967961A
Cited
US2220045A
Cited
US2379661A
Cited
US2354932A
Cited
US2618846A
Cited
US2612350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |