US2895398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating system for a building, e.g. a building divided into flats
Assignee: Nv Outwerp- & Exploitatiebureau "shunt"
•
Filing: 1956-10-24
•
Granted: 1959-07-21
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Expires: 1976-10-24
Abstract
No abstract record available.
Inventors
- 👤 Hekelaar Johannes Petrus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:45
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US292444A
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US328818A
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US445486A
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US533454A
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US982721A
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US1087380A
Cited
US1448149A
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US2164394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |