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Patent US3557611A successfully refreshed from Google Patents.
US3557611A
Expired / Lapsed
US
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Tonometer with correct usage indicator
Assignee: Computer Instruments Corp
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Filing: 1968-11-01
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Granted: 1971-01-26
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Expires: 1988-11-01
Abstract
Abstract PRESSURE GAUGE AS AN INDICATION OF SUCH CORRECT OPERATION OF THE INSTRUMENT. IN A PROJECTING PLUNGER TYPE OF TONOMETER, A CIRCULAR ORIFICE IS DISPOSED AROUND THE PLUNGER IN THE END WALL OF THE PROBE COMMUNICATING WITH A CHAMBER SUPPLIED WITH AIR FROM A LOW CAPACITY PUMP. PROPER APPLICATION OF THE TONOMETER TO AN EYEBALL WILL OCCLUDE THE ENTIRE CIRCULAR ORIFICE CAUSING THE AIR PRESSURE WITHIN THE AFORESAID CHAMBER TO BUILD UP TO THE MAXIMUM CAPACITY OF THE PUMP WITHIN THE TIME NECESSARY FOR THE INSTRUMENT TO TAKE A TONOMETRIC READING WHICH PRESSURE CAN BE READ FROM A
Inventors
- 👤 Herbert H Adise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:23
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |