US2917284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Individual
•
Filing: 1956-05-04
•
Granted: 1959-12-15
•
Expires: 1976-05-04
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:54
CPC Classifications
C; C11; C11B; C11B1/00; F; F28; F28D; F28D11/00; F28D11/02; Y; Y10; Y10S; Y10S165/00; Y10S165/228; Y10S165/229
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1155190A
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CH112802A
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GB329723A
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US2274948A
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US2319429A
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DE877326C
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US2516071A
Cited
DE815103C
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US2686336A
Cited
DE915689C
Cited
US2721806A
Cited
US2745856A
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US2753159A
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US2731241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |