US3403531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chimney cooler for the cooling of liquids by means of atmospheric air
Assignee: Individual
•
Filing: 1967-01-19
•
Granted: 1968-10-01
•
Expires: 1987-01-19
Abstract
No abstract record available.
Inventors
- 👤 Oesterheld Karl Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:58
CPC Classifications
F; F28; F28D; F28D5/00; F28D5/02; F28F; F28F1/00; F28F1/02; F28F1/04; F28F21/00; F28F21/04; F28F3/00; F28F3/08; F28F3/083; Y; Y10; Y10S; Y10S261/00; Y10S261/11
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) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |