Patent US2637086A successfully refreshed from Google Patents.
Patent US2428442A successfully refreshed from Google Patents.
US2428442A
Expired / Lapsed
US
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Assignee: —
•
Filing: —
•
Granted: 1947-10-07
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Expires: 1964-10-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:49
CPC Classifications
A; A47; A47B; A47B88/00; A47B88/90; A47B88/969; G; G07; G07G; G07G1/00; G07G1/0018; G07G1/0027; A47B88/988
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) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |