US3534814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger construction
Assignee: Trane US Inc
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Filing: 1969-06-09
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Granted: 1970-10-20
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Expires: 1989-06-09
Abstract
No abstract record available.
Inventors
- 👤 Peter N Renzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:07
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/085; F28F1/00; F28F1/10; F28F1/12; F28F1/122; F28F21/084; H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/48; H05B3/50; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |