US2439482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starting system for free
Assignee: —
•
Filing: —
•
Granted: 1948-04-13
•
Expires: 1965-04-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:36
CPC Classifications
F; F02; F02B; F02B71/00; F02B71/02; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US387256A
Cited
GB190614413A
Cited
GB225397A
Cited
US1763426A
Cited
US1646640A
Cited
US1799914A
Cited
US1918341A
Cited
US2215326A
Cited
US2168828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |