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US3495437A
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Method and apparatus for zero-setting and calibrating vapor-responsive detectors
Assignee: United States Steel Corp
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Filing: 1968-05-09
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Granted: 1970-02-17
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Expires: 1988-05-09
Abstract
No abstract record available.
Inventors
- 👤 Bay E Estes
- 👤 Stephen R Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:56
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0006; G01N21/00; G01N21/84; G01N21/88; G01N21/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2582647A
Cited
US3310974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |