US2828761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self flushing device for evaporative cooler and cooling tower sump
Assignee: Individual
•
Filing: 1955-12-21
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Granted: 1958-04-01
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Expires: 1975-12-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Bayard E Weibert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:15
CPC Classifications
F; F24; F24F; F24F6/00; F24F6/02; F24F6/04; G; G05; G05D; G05D9/00; G05D9/12; F28; F28F; F28F25/00; F28F2025/005; F28F27/00; F28F27/003; Y; Y10; Y10T; Y10T137/00; Y10T137/2713; Y10T137/2774; Y10T137/4673; Y10T137/4824; Y10T137/8593; Y10T137/86187; Y10T137/86228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |