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Patent US2731920A successfully refreshed from Google Patents.
US2731920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scognamillq
Assignee: —
•
Filing: —
•
Granted: 1956-01-24
•
Expires: 1973-01-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:30
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/348; F04C2/3441; F04C2/3442
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB203621A
Cited
FR567879A
Cited
US1610748A
Cited
GB241751A
Cited
GB244001A
Cited
GB399357A
Cited
FR740479A
Cited
GB510545A
Cited
GB534339A
Cited
US2590730A
Cited
US2590728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |