US2699322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Individual
•
Filing: 1950-08-19
•
Granted: 1955-01-11
•
Expires: 1970-08-19
Abstract
No abstract record available.
Inventors
- 👤 Henry H Feldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:56
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0012; F28D9/0018; Y; Y10; Y10S; Y10S165/00; Y10S165/051
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE19649C
Cited
US314003A
Cited
DE642052C
Cited
FR338603A
Cited
US953607A
Cited
US1028792A
Cited
GB140635A
Cited
US1650122A
Cited
US2117337A
Cited
US2136086A
Cited
US2473641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |