US2517020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilated building construction
Assignee: Individual
•
Filing: 1946-05-17
•
Granted: 1950-08-01
•
Expires: 1966-05-17
Abstract
No abstract record available.
Inventors
- 👤 Ong William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:08
CPC Classifications
F; F24; F24F; F24F7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US799755A
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US1086031A
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US1065762A
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FR602489A
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US2074370A
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US2107523A
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US2210960A
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US2225244A
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US2364220A
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US2419806A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-31 | 1954-01-30 | 1954-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-31 | 1958-01-30 | 1958-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-31 | 1962-01-30 | 1962-08-01 | $7700.00 | Window Closed / Lapsed |