US2717320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Reliance Electric and Engineering Co
•
Filing: 1952-03-10
•
Granted: 1955-09-06
•
Expires: 1972-03-10
Abstract
No abstract record available.
Inventors
- 👤 Walter L Shoulders
- 👤 Robert R Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:37
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/14; H02K9/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1519673A
Cited
GB252791A
Cited
GB351906A
Cited
US1921056A
Cited
US2171253A
Cited
US2460957A
Cited
US2529516A
Cited
US2654583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-05 | 1959-03-07 | 1959-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-05 | 1963-03-07 | 1963-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-05 | 1967-03-07 | 1967-09-06 | $7700.00 | Window Closed / Lapsed |