US3545097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High thermal conductivity plastic tray for freeze drying of products
Assignee: Pennwalt Corp
•
Filing: 1968-12-09
•
Granted: 1970-12-08
•
Expires: 1988-12-09
Abstract
No abstract record available.
Inventors
- 👤 Paul Francis Waltrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:20
CPC Classifications
F; F26; F26B; F26B25/00; F26B25/06; F26B25/14; F26B25/18; F26B5/00; F26B5/04; F26B5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB558124A
Cited
US2799793A
Cited
US3247602A
Cited
US3321012A
Cited
US3261110A
Cited
US3239000A
Cited
US3264747A
Cited
US3264756A
Cited
US3360498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |