US3400753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leak preventing control for heat exchangers
Assignee: Phillips Petroleum Co
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Filing: 1966-09-02
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Granted: 1968-09-10
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Expires: 1986-09-02
Abstract
No abstract record available.
Inventors
- 👤 James W Slover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:13
CPC Classifications
G; G21; G21C; G21C17/00; G21C17/002; F; F22; F22B; F22B37/00; F22B37/02; F22B37/42; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2703; Y10T137/2705; Y10T137/5762; Y10T137/7722; Y10T137/7723; Y10T137/7725
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) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |