US2839218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure vessel closure
Assignee: AO Smith Corp
•
Filing: 1954-07-06
•
Granted: 1958-06-17
•
Expires: 1974-07-06
Abstract
No abstract record available.
Inventors
- 👤 Frederick K Zerbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:05
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/03; F; F16; F16J; F16J13/00; F16J13/02; F16J13/10; Y; Y10; Y10T; Y10T292/00; Y10T292/20; Y10T292/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE72036C
Cited
US1312626A
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US1946494A
Cited
US1173422A
Cited
GB291320A
Cited
US2354532A
Cited
US2436407A
Cited
FR920539A
Cited
US2532854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |