Patent US3004394A successfully refreshed from Google Patents.
US3004394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helium heat rectifier
Assignee: Individual
•
Filing: 1957-04-22
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Granted: 1961-10-17
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Expires: 1977-04-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles Darby Fulton
- 👤 William M Fairbank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:59
CPC Classifications
F; F17; F17C; F17C13/00; F25; F25B; F25B21/00; F25B2321/00; F25B2321/002; F25B2321/0021; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A THERMAL VALUE OF THE CHARACTER DESCRIBED COMPRISING A SEALED CHAMBER AND A LIQUID MIXTURE OF HELIUM ISOTOPES 3 AND 4 COMPRISING BETWEEN LESS THAN ONE PERCENT AND ONE-TENTH OF ONE PERCENT OF HELIUM 3 IN SAID CHAMBER.
Claim 2
Dependent Claim
38 words
A THERMAL VALUE OF THE CHARACTER DESCRIBED COMPRISING A SEALED CHAMBER AND A LIQUID MIXTURE OF HELIUM ISOTOPES 3 AND 4 COMPRISING BETWEEN LESS THAN ONE PERCENT AND ONE-TENTH OF ONE PERCENT OF HELIUM 3 IN SAID CHAMBER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-16 | 1965-04-17 | 1965-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-16 | 1969-04-17 | 1969-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-16 | 1973-04-17 | 1973-10-17 | $7700.00 | Window Closed / Lapsed |