Pipetting system
Abstract
Abstract A HOLLOW CYLINDRICAL BODY HAS AN APERTURED LOWER END PORTION FOR FRICTIONALLY ATTACHING REMOVABLE TIPS. A MOVABLE PISTON, WITHIN THE BODY, EXTENDS INTO THE LOWER END PORTION. A COLLAR IS FIXED TO THE UPPER PORTION OF THE PISTON AND MOVES WITHIN A CALIBRATING CUP. THE CALIBRATING CUP ALSO MOVES WITHIN THE BODY. DEPRESSING A KNOB ATTACHED TO THE UPPER END OF THE PISTON WILL OVERCOME THE TENSION IN A PRIMARY SPRING, WHICH IS INTERPOSED BETWEEN A PORTION OF THE PISTON AND THE BODY, UNTIL THE CALIBRATING COLLAR STRIKES THE BOTTOM OF THE CALIBRATING CUP CONSTITUTING THE CALIBRATION MOVEMENT OF THE PISTON. AN OVER-SHOOT OF TRAVEL BY THE PISTON MAY BE ACCOMPLISHED BY FURTHER DEPRESSING THE KNOB AGAINST THE ACTION OF A RELATIVELY STIFF SECONDARY SPRING INTERPOSED BETWEEN THE BOTTOM OF THE CUP AND THE BODY.
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Bibliographic Details
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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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |