US3498371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer device
Assignee: Individual
•
Filing: 1967-06-12
•
Granted: 1970-03-03
•
Expires: 1987-06-12
Abstract
No abstract record available.
Inventors
- 👤 Alfred E Zygiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:13
CPC Classifications
F; F28; F28F; F28F7/00; F28F7/02; F28D; F28D7/00; F28D7/0066; F28D7/02; F28D7/024; F28D7/08; F28D7/082; F28D7/085; F28F21/00; F28F21/06; F28F2275/00; F28F2275/02; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/395; Y10S165/397; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |