US3134512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispensing apparatus
Assignee: Beckman Coulter Inc
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Filing: 1961-07-25
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Granted: 1964-05-26
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Expires: 1981-07-25
Abstract
No abstract record available.
Inventors
- 👤 Ben J Lehman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:37
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/0282
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A DISPENSING APPARATUS FOR THE DELIVERY OF MEASURED VOLUMES OF LIQUID COMPRISING A PIPETTE OF PREDETERMINED LENGTH AND CROSS-SECTIONAL AREA WHEREBY AT ITS FULL STATE IT WILL RETAIN A PREDETERMINED VOLUME OF LIQUID, A RESERVOIR SERVING TO RETAIN LIQUID, MEANS FORMING A CHAMBER, COMMUNICATION MEANS FOR TRANSFERRING THE LIQUID BETWEEN THE RESERVOIR AND CHAMBER, SAID PIPETTE HAVING ONE END EXTENDING INTO THE CHAMBER, VALVE MEANS PROVIDING COMMUNICATION BETWEEN THE INTERIOR OF THE CHAMBER AND THE SURROUNDS TO ALLOW AIR TO TRAVEL INTO THE CHAMBER, MEANS FOR APPLYING PRESSURE IN SAID RESERVOIR TO CAUSE THE LIQUID TO RISE INTO THE CHAMBER AND SUBMERGE SAID ONE END OF THE PIPETTE, SAID VALVE MEANS BEING CONSTRUCTED AND ARRANGED TO BE CLOSED AUTOMATICALLY AT LEAST WHEN SAID ONE END OF THE PIPETTE IS SUBMERGED TO THEREBY CREATE PRESSURE WITHIN THE CHAMBER AND CAUSE THE LIQUID TO FLOW OUTWARDLY INTO THE PIPETTE AND FILL THE SAME, SAID VALVE MEANS SERVING TO OPEN UPON REMOVAL OF SAID PRESSURE TO ALLOW AIR TO FLOW INTO THE CHAMBER AND THE LIQUID IN THE CHAMBER TO FLOW DOWNWARDLY INTO THE RESERVOIR WHEREBY SUBSEQUENT APPLICATION OF SAID PRESSURE MEANS PURGES SAID PIPETTE OF LIQUID REMAINING THEREIN.
Claim 2
Dependent Claim
196 words
A DISPENSING APPARATUS FOR THE DELIVERY OF MEASURED VOLUMES OF LIQUID COMPRISING A PIPETTE OF PREDETERMINED LENGTH AND CROSS-SECTIONAL AREA WHEREBY AT ITS FULL STATE IT WILL RETAIN A PREDETERMINED VOLUME OF LIQUID, A RESERVOIR SERVING TO RETAIN LIQUID, MEANS FORMING A CHAMBER, COMMUNICATION MEANS FOR TRANSFERRING THE LIQUID BETWEEN THE RESERVOIR AND CHAMBER, SAID PIPETTE HAVING ONE END EXTENDING INTO THE CHAMBER, VALVE MEANS PROVIDING COMMUNICATION BETWEEN THE INTERIOR OF THE CHAMBER AND THE SURROUNDS TO ALLOW AIR TO TRAVEL INTO THE CHAMBER, MEANS FOR APPLYING PRESSURE IN SAID RESERVOIR TO CAUSE THE LIQUID TO RISE INTO THE CHAMBER AND SUBMERGE SAID ONE END OF THE PIPETTE, SAID VALVE MEANS BEING CONSTRUCTED AND ARRANGED TO BE CLOSED AUTOMATICALLY AT LEAST WHEN SAID ONE END OF THE PIPETTE IS SUBMERGED TO THEREBY CREATE PRESSURE WITHIN THE CHAMBER AND CAUSE THE LIQUID TO FLOW OUTWARDLY INTO THE PIPETTE AND FILL THE SAME, SAID VALVE MEANS SERVING TO OPEN UPON REMOVAL OF SAID PRESSURE TO ALLOW AIR TO FLOW INTO THE CHAMBER AND THE LIQUID IN THE CHAMBER TO FLOW DOWNWARDLY INTO THE RESERVOIR WHEREBY SUBSEQUENT APPLICATION OF SAID PRESSURE MEANS PURGES SAID PIPETTE OF LIQUID REMAINING THEREIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |