US3049341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange structure
Assignee: Individual
•
Filing: 1957-07-26
•
Granted: 1962-08-14
•
Expires: 1977-07-26
Abstract
No abstract record available.
Inventors
- 👤 William G Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:35
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/12; F24D3/16; F24D3/122; F24D3/127; F24D3/165; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2660409A
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US2721731A
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CH293380A
Cited
US2729431A
Cited
US2729411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |