US3033535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubulous heat exchangers
Assignee: Babcock International Ltd
•
Filing: 1958-06-25
•
Granted: 1962-05-08
•
Expires: 1978-06-25
Abstract
No abstract record available.
Inventors
- 👤 Willem F C Schaap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:19
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/14; F22B37/141; F22G; F22G7/00; F22G7/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1900443A
Cited
US1901090A
Cited
US2054404A
Cited
GB537043A
Cited
US2301433A
Cited
US2619809A
Cited
US2867416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |