Patent US2699322A successfully refreshed from Google Patents.
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 14:26
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0012; F28D9/0018; Y; Y10; Y10S; Y10S165/00; Y10S165/051
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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 |