US3474543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for simultaneously freeze drying a plurality of bacterial cultures
Assignee: Virtis Co Inc
•
Filing: 1967-11-24
•
Granted: 1969-10-28
•
Expires: 1987-11-24
Abstract
No abstract record available.
Inventors
- 👤 Charles E Bender
- 👤 Taylor N Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:49
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/04; F26B5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2353986A
Cited
US2307802A
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US2477044A
Cited
US2859534A
Cited
US3138937A
Cited
US3246674A
Cited
US3293773A
Cited
US3293772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |