US2893702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Individual
•
Filing: 1956-09-20
•
Granted: 1959-07-07
•
Expires: 1976-09-20
Abstract
No abstract record available.
Inventors
- 👤 Richardson Edward Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:26
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/003; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/399; Y10S165/907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE508965C
Cited
US1716333A
Cited
US1285916A
Cited
US1815570A
Cited
US1966034A
Cited
US2157596A
Cited
US2595457A
Cited
GB702640A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-06 | 1963-01-05 | 1963-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-06 | 1967-01-05 | 1967-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-06 | 1971-01-05 | 1971-07-07 | $7700.00 | Window Closed / Lapsed |