US2916807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange equipment
Assignee: Individual
•
Filing: 1953-10-15
•
Granted: 1959-12-15
•
Expires: 1973-10-15
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:24
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE23635C
Cited
US1623766A
Cited
US1748206A
Cited
US1899715A
Cited
US1915312A
Cited
US2036417A
Cited
US2383133A
Cited
US2767466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |