US3538984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger unit
Assignee: Individual
•
Filing: 1968-05-15
•
Granted: 1970-11-10
•
Expires: 1988-05-15
Abstract
No abstract record available.
Inventors
- 👤 Paul Leopold Kaesermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:13
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0219; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/0535; F28D1/05366; F28D1/05383; F28F1/00; F28F1/02; F28F1/10; F28F1/12; F28F1/24; F28F1/32
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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |