US3233418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for liquefying helium
Assignee: US Philips Corp
•
Filing: 1962-07-23
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Granted: 1966-02-08
•
Expires: 1982-07-23
Abstract
No abstract record available.
Inventors
- 👤 Shaievitz Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:19
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0225; F25J1/0227; F25J1/0002; F25J1/0005; F25J1/0007; F25J1/003; F25J1/0032; F25J1/0035; F25J1/0037; F25J1/004; F25J1/0201; F25J1/0202; F25J2210/00; F25J2210/02; F25J2220/00; F25J2220/02; F25J2270/00; F25J2270/90; F25J2270/908
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1901389A
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US1961201A
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US2764877A
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US2895303A
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US2957318A
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US2909903A
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US2964913A
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US2932173A
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US2937076A
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US3098732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |