US3468371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers
Assignee: Individual
•
Filing: 1967-09-08
•
Granted: 1969-09-23
•
Expires: 1987-09-08
Abstract
No abstract record available.
Inventors
- 👤 Diedrich Menze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:40
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; F; F28; F28D; F28D7/00; F28D7/02; F28D7/026; F28D7/10; F28D7/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE31764C
Cited
US1005442A
Cited
US1132420A
Cited
US1970824A
Cited
US2152280A
Cited
US2993682A
Cited
US3158192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |