US2528844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kitchen ventilator
Assignee: Individual
•
Filing: 1947-09-08
•
Granted: 1950-11-07
•
Expires: 1967-09-08
Abstract
No abstract record available.
Inventors
- 👤 Roy B Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:48
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/20; Y; Y10; Y10S; Y10S55/00; Y10S55/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1267808A
Cited
US1671524A
Cited
GB266646A
Cited
US1860068A
Cited
US1802617A
Cited
US1922070A
Cited
US2077496A
Cited
US2226641A
Cited
US2369375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |