US2219637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow retarder
Assignee: Aluminum Plant & Vessel Co Ltd
•
Filing: 1939-01-09
•
Granted: 1940-10-29
•
Expires: 1959-01-09
Abstract
No abstract record available.
Inventors
- 👤 Seligman Richard
- 👤 Goodman Hugh Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:23
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/40; A23B2/42; A23B2/44; F; F28; F28D; F28D9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-10-29 | 1944-04-29 | 1944-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-29 | 1948-04-29 | 1948-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-29 | 1952-04-29 | 1952-10-29 | $7700.00 | Window Closed / Lapsed |