Patent US3439105A successfully refreshed from Google Patents.
US3431508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ph detecting device using temperature compensated field-effect transistor differential amplifier
Assignee: Honeywell Inc
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Filing: 1966-03-16
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Granted: 1969-03-04
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Expires: 1986-03-16
Abstract
No abstract record available.
Inventors
- 👤 Daniel J Soltz
- 👤 Homer L Greer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:49
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/4508; G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/414; G01N27/4148; H03F3/45179; H03F3/45183; H03F3/45479; H03F3/45632; H03F3/45744; H03F2203/00; H03F2203/45; H03F2203/45476; H03F2203/45686; H03F2203/45688; H03F2203/45696
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) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |