US3564907A
Expired / Lapsed
US
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Applanation tonometer
Assignee: Johns Hopkins University
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Filing: 1967-11-17
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Granted: 1971-02-23
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Expires: 1987-11-17
Abstract
Abstract AN ALL-ELECTRIC TONOMETER OF THE APPLANATION TYPE IS DISCLOSED. IN THE FORM OF A PEN-SIZE PROBE FOR APPLICATION TO THE CORNEA OF A PATIENT, THE DEVICE MAKES USE OF A STRAIN GAUGE T PRODUCE A FORCE SIGNAL. THE TEAR-WETTED AREA OF THE APPLANATION SURFACE PRODUCES ANOTHER SIGNAL PROPORTIONAL TO THIS AREA AND THE SIGNALS ARE EFFECTIVELY COMBINED AND READ OUT AS INTRAOCULAR PRESSURE ON A SINGLE METER.
Inventors
- 👤 Harry F Holcomb
- 👤 Miquel Martinez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:36
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |