US3505993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrocardiograph electrodes with surface convexities
Assignee: National Research Development Corp UK
•
Filing: 1965-12-17
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Granted: 1970-04-14
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Expires: 1985-12-17
Abstract
No abstract record available.
Inventors
- 👤 David Steel Lewes
- 👤 Kenneth John Hebblethwaite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:11
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/25; A61B5/251; A61B5/252; A61B5/279; A61B5/28; A61N; A61N1/00; A61N1/02; A61N1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US872688A
Cited
US1889271A
Cited
US1935138A
Cited
US2580628A
Cited
US2660175A
Cited
US3067749A
Cited
US3295515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-13 | 1973-10-13 | 1974-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-13 | 1977-10-13 | 1978-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-13 | 1981-10-13 | 1982-04-14 | $7700.00 | Window Closed / Lapsed |