US2856950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid unloading system
Assignee: Ethyl Corp
•
Filing: 1955-11-01
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Granted: 1958-10-21
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Expires: 1975-11-01
Abstract
No abstract record available.
Inventors
- 👤 Leif A Zars
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:27
CPC Classifications
B; B67; B67D; B67D7/00; B67D7/06; B67D7/32; B67D7/3227; Y; Y10; Y10T; Y10T137/00; Y10T137/2713; Y10T137/2842; Y10T137/2856; Y10T137/2931; Y10T137/3109
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US300328A
Cited
US2682886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |