Patent US2780306A successfully refreshed from Google Patents.
US2780306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling tower
Assignee: Individual
•
Filing: 1953-08-31
•
Granted: 1957-02-05
•
Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 John R Boyle
- 👤 Jr John R Boyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:30
CPC Classifications
F; F28; F28C; F28C1/00; F28C1/02; F28F; F28F25/00; F28F25/02; F28F25/06; F28F25/08; F28F25/082; Y; Y02; Y02B; Y02B30/00; Y02B30/70; Y10; Y10S; Y10S261/00; Y10S261/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2435798A
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US2627396A
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US2634959A
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Cited
US2681217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |