US2648953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid helium container with insertable heat exchanger
Assignee: HOFMAN LAB Inc
•
Filing: 1951-06-22
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Granted: 1953-08-18
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Expires: 1971-06-22
Abstract
No abstract record available.
Inventors
- 👤 Gerard F Sulfrian
- 👤 Howard S Jacket
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:55
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/06; B; B65; B65D; B65D39/00; B65D39/08; Y; Y10; Y10S; Y10S220/00; Y10S220/918; Y10S220/92
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1120369A
Cited
US1938036A
Cited
US2196785A
Cited
US2195077A
Cited
US2239511A
Cited
US2329765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |