US2428461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Checker brick heat exchanger
Assignee: SP Kinney Engineers Inc
•
Filing: 1944-07-08
•
Granted: 1947-10-07
•
Expires: 1964-07-08
Abstract
No abstract record available.
Inventors
- 👤 Selwyne P Kinney
- 👤 Louis M Hartwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:26
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/02; C21B9/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US863786A
Cited
GB121536A
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US1624128A
Cited
US1587171A
Cited
US1835074A
Cited
US1880011A
Cited
US1860368A
Cited
US1927834A
Cited
GB461458A
Cited
FR49743E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |