US2859948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Corning Glass Works
•
Filing: 1954-08-26
•
Granted: 1958-11-11
•
Expires: 1974-08-26
Abstract
No abstract record available.
Inventors
- 👤 Robert L Callard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:00
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/04; F28F9/06; F28F9/14; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/067; Y10S165/068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1412056A
Cited
US1575497A
Cited
GB406584A
Cited
US2196683A
Cited
US2313308A
Cited
US2504496A
Cited
US2467312A
Cited
DE821798C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |