Patent US3387836A successfully refreshed from Google Patents.
US3387836A
Expired / Lapsed
US
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Heat exchange apparatus
Assignee: ANDCO INCORPORATED A CORP OF NY
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Filing: 1967-09-18
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Granted: 1968-06-11
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Expires: 1987-09-18
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:27
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/02; C21B9/06; F; F28; F28F; F28F21/00; F28F21/04; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/053
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |