US4913145B1
Expired / Lapsed
US
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Cardiac pacemaker with switched capacitor amplifiers
Assignee: Intermedics Inc
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Filing: 1988-05-16
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Granted: 1997-09-09
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Expires: 2008-05-16
Abstract
Abstract A circuit for generating a voltage reference comprises a diodes array (D1) working in conjunction with a switched capacitor amplifier (99) having auto-zero and measure phases so as to create a voltage independent of temperature, a sample and hold circuit (85) which holds the final voltage and buffers for outside use and a feed-back circuit (92) to make the reference voltage insensitive to other circuit components.
Inventors
- 👤 Lawrence J Stotts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/37; A61N1/3706; A61N1/3708; A61N1/3702; A61N1/3704
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-08 | 2001-03-10 | 2001-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-08 | 2005-03-10 | 2005-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-08 | 2009-03-10 | 2009-09-09 | $7700.00 | Window Closed / Lapsed |