Patent US3450194A successfully refreshed from Google Patents.
US3450194A
Expired / Lapsed
US
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Greenhouse air-cooling system
Assignee: Individual
•
Filing: 1967-12-05
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Granted: 1969-06-17
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Expires: 1987-12-05
Abstract
No abstract record available.
Inventors
- 👤 Gerhard Barthel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:33
CPC Classifications
A; A01; A01G; A01G9/00; A01G9/24; A01G9/246; F; F24; F24F; F24F5/00; F24F5/0007; F24F5/0017; F24F5/0046; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/25; Y02E; Y02E60/00; Y02E60/14
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) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |