US3531871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for continuous freeze-drying
Assignee: Individual
•
Filing: 1968-08-12
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Granted: 1970-10-06
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Expires: 1988-08-12
Abstract
No abstract record available.
Inventors
- 👤 Yukio Sahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:15
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/04; F26B5/06; Y; Y02; Y02B; Y02B30/00; Y02B30/52
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) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |