US3439272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital voltmeter controlled by increments of electrical charge applied to a capacitor feedback amplifier
Assignee: Gemalto Terminals Ltd
•
Filing: 1965-05-28
•
Granted: 1969-04-15
•
Expires: 1985-05-28
Abstract
No abstract record available.
Inventors
- 👤 Christopher E G Bailey
- 👤 Eric Metcalf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:43
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/50; H03M1/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2713135A
Cited
US3140479A
Cited
US3188455A
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US3218630A
Cited
US3237190A
Cited
US3251052A
Cited
US3281827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |