US3403724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers
Assignee: Individual
•
Filing: 1966-07-25
•
Granted: 1968-10-01
•
Expires: 1986-07-25
Abstract
No abstract record available.
Inventors
- 👤 Gutkowski Janusz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:05
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/12; F02C7/14; F28; F28D; F28D9/00; F28D9/0031; F28D9/0037
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA673139A
Cited
US1202109A
Cited
US1906984A
Cited
US2893702A
Cited
US2596008A
Cited
US2558624A
Cited
US2686154A
Cited
US3157229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |