US3484946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for freeze-freeze drying
Assignee: AT&T Inc
•
Filing: 1967-12-06
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Granted: 1969-12-23
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Expires: 1987-12-06
Abstract
No abstract record available.
Inventors
- 👤 Harold A Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:59
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/04; F26B5/06; F26B5/065; F25; F25C; F25C1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2751762A
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US3079761A
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US3269025A
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US3262212A
Cited
US3255534A
Cited
US3263335A
Cited
US3299525A
Cited
US3297454A
Cited
US3313032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |