US2989289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange device
Assignee: Individual
•
Filing: 1959-06-15
•
Granted: 1961-06-20
•
Expires: 1979-06-15
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:03
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/02; C04B11/028; Y; Y10; Y10S; Y10S165/00; Y10S165/135; Y10S165/139; Y10S165/147; Y10S165/148
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US565637A
Cited
US1993264A
Cited
US2027185A
Cited
US2045823A
Cited
US2541201A
Cited
US2600842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |