US2621637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor generator
Assignee: Foster Wheeler Inc
•
Filing: 1946-08-20
•
Granted: 1952-12-16
•
Expires: 1966-08-20
Abstract
No abstract record available.
Inventors
- 👤 Frisch Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:00
CPC Classifications
F; F22; F22B; F22B29/00; F22B29/06; F22B29/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1860363A
Cited
US1883293A
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US1835610A
Cited
US2170348A
Cited
US2321390A
Cited
US2405573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |