Patent US3528256A successfully refreshed from Google Patents.
US3528256A
Expired / Lapsed
US
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Freeze crystallization using direct refrigerant
Assignee: Blaw Knox Co
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Filing: 1967-02-13
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Granted: 1970-09-15
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Expires: 1987-02-13
Abstract
No abstract record available.
Inventors
- 👤 George B Karnofsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:17
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/22; F; F25; F25C; F25C1/00; C02F2103/00; C02F2103/08; Y; Y02; Y02A; Y02A20/00; Y02A20/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3126334A
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US2997856A
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US3243966A
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US3285026A
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US3304734A
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US3400549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |