US3487670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming indentations in fins extending from a heat transfer surface
Assignee: Trane US Inc
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Filing: 1967-04-17
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Granted: 1970-01-06
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Expires: 1987-04-17
Abstract
No abstract record available.
Inventors
- 👤 Chester D Ware
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:22
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21C37/207; Y; Y10; Y10S; Y10S72/00; Y10S72/703; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |