US2746674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating fans
Assignee: Individual
•
Filing: 1953-12-23
•
Granted: 1956-05-22
•
Expires: 1973-12-23
Abstract
No abstract record available.
Inventors
- 👤 Lawrence L Alldritt
- 👤 Alldritt Della May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:30
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/60; F04D29/64; F04D29/644; F04D29/646
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2148524A
Cited
US2191418A
Cited
US2218348A
Cited
GB568405A
Cited
US2385152A
Cited
US2529040A
Cited
US2612831A
Cited
US2573145A
Cited
US2620722A
Cited
US2643053A
Cited
US2700500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |