Patent US3403527A successfully refreshed from Google Patents.
US3403527A
Expired / Lapsed
US
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Transverse-parallel flow cryogenic freezer
Assignee: Air Products and Chemicals Inc
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Filing: 1967-06-01
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Granted: 1968-10-01
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Expires: 1987-06-01
Abstract
No abstract record available.
Inventors
- 👤 Raymond L Berreth
- 👤 Roger A Howells
- 👤 David J Klee
- 👤 Keith A Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:34
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/16; F25; F25D; F25D3/00; F25D3/10; F25D3/11
Claims Analysis
Total Claims: 0
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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) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |