Patent US2859946A successfully refreshed from Google Patents.
US2859946A
Expired / Lapsed
US
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Heat exchange device
Assignee: Individual
•
Filing: 1955-01-31
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Granted: 1958-11-11
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Expires: 1975-01-31
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
2026-10-25 02:35
CPC Classifications
F; F28; F28D; F28D5/00; F28D5/02; F28D7/00; F28D7/02; F28D7/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US463467A
Cited
US2062158A
Cited
US2117411A
Cited
US2211813A
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US2267315A
Cited
US2233031A
Cited
US2509031A
Cited
US2600738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |