Patent US3429176A successfully refreshed from Google Patents.
US3429176A
Expired / Lapsed
US
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Chromatographic equipment safe for use in hazardous atmospheres
Assignee: BP PLC
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Filing: 1965-07-14
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Granted: 1969-02-25
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Expires: 1985-07-14
Abstract
No abstract record available.
Inventors
- 👤 William Henry Topham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:01
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30; G01N2030/3084; G01N30/60; G01N30/6047; G01N30/88
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2618150A
Cited
US2652315A
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US2982123A
Cited
US3026712A
Cited
US3070989A
Cited
US3205701A
Cited
US3276243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |