US2980334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damper control system for process heaters
Assignee: Sunoco Inc
•
Filing: 1957-07-25
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Granted: 1961-04-18
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Expires: 1977-07-25
Abstract
No abstract record available.
Inventors
- 👤 Donald J Geniesse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:40
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/22; G05D23/2236; G05D23/2237; F; F23; F23N; F23N3/00; F23N3/04; F23N3/042; F23N5/00; F23N5/003; F23N5/006; F23N2235/00; F23N2235/02; F23N2235/06; F23N2235/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1895701A
Cited
US1940355A
Cited
US1956577A
Cited
US2052375A
Cited
US2370897A
Cited
US2586503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |