Patent US3512239A successfully refreshed from Google Patents.
US3512239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming dimpled plate heat exchanger elements by the use of hydrostatic pressure
Assignee: Rosenblad Corp
•
Filing: 1967-04-19
•
Granted: 1970-05-19
•
Expires: 1987-04-19
Abstract
No abstract record available.
Inventors
- 👤 Axel E Rosenblad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:05
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; B21D53/045; F; F28; F28F; F28F3/00; F28F3/12; F28F3/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49369; Y10T29/49371; Y10T29/49805
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1685388A
Cited
US1709865A
Cited
US3094956A
Cited
US3024002A
Cited
US2993263A
Cited
US3053211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |