US2921804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defrosting means for turbo-expanders
Assignee: Worthington Corp
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Filing: 1957-04-23
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Granted: 1960-01-19
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Expires: 1977-04-23
Abstract
No abstract record available.
Inventors
- 👤 Walter K Jekat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:42
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/08; F01D25/14; F01D25/145; F01D25/02; F04; F04D; F04D29/00; F04D29/58; F04D29/582; F04D29/584
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) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |