Patent US2673899A successfully refreshed from Google Patents.
US2673899A
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Automatic volume control system
Assignee: Phillips Petroleum Co
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Filing: 1949-09-23
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Granted: 1954-03-30
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Expires: 1969-09-23
Abstract
No abstract record available.
Inventors
- 👤 Orin C Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:49
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/24; G01V1/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2164939A
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US2354420A
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US2374204A
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US2301739A
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US2316354A
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US2352825A
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US2423797A
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US2408001A
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US2532263A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |