US2835231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor generating and superheating unit
Assignee: Babcock and Wilcox Co
•
Filing: 1953-05-19
•
Granted: 1958-05-20
•
Expires: 1973-05-19
Abstract
No abstract record available.
Inventors
- 👤 Richard H Evans
- 👤 Beuthner Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:31
CPC Classifications
F; F22; F22G; F22G7/00; F22G7/14; F22B; F22B21/00; F22B21/34; F22B21/341; F22B21/343; F22B31/00; F22B31/04; F22B37/00; F22B37/02; F22B37/10; F22B37/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2220886A
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US2213185A
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US2308762A
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US2424476A
Cited
DE829740C
Cited
US2730080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |