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Patent US3422632A successfully refreshed from Google Patents.
US3422632A
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Cryogenic refrigeration system
Assignee: Air Products and Chemicals Inc
•
Filing: 1966-06-03
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Granted: 1969-01-21
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Expires: 1986-06-03
Abstract
No abstract record available.
Inventors
- 👤 Robert B Currie
- 👤 Martin S Sellinger
- 👤 Henry F Villaume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:51
CPC Classifications
F; F17; F17C; F17C3/00; F17C3/02; F17C3/08; F17C3/085; F25; F25B; F25B9/00; F25B9/02; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/32; Y02P; Y02P90/00; Y02P90/45
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2909908A
Cited
US3195322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |