US2937782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head closure construction for heat exchanger
Assignee: Griscom Russell Co
•
Filing: 1957-01-04
•
Granted: 1960-05-24
•
Expires: 1977-01-04
Abstract
No abstract record available.
Inventors
- 👤 Oscar W Heimberger
- 👤 Jr Frank Boni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:49
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0202; F28F9/0204; F28F9/0207; Y; Y10; Y10T; Y10T292/00; Y10T292/20; Y10T292/205; Y10T292/209; Y10T292/71; Y10T292/73
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US539925A
Cited
US2029606A
Cited
US2252488A
Cited
FR903569A
Cited
US2616587A
Cited
US2711266A
Cited
US2766903A
Cited
US2821325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |