US3248950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stop mechanism for pipette filling device
Assignee: Dow Chemical Co
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Filing: 1964-05-25
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Granted: 1966-05-03
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Expires: 1984-05-25
Abstract
No abstract record available.
Inventors
- 👤 Alfred R Pursell
- 👤 Edward E Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:35
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; B01L3/0224
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
AN IMPROVED PIPETTING DEVICE COMPRISING: A SYRINGE HAVING AN ASSOCIATED PLUNGER AND BARREL, SAID PLUNGER HAVING A FINGER-ENGAGING TOP END AND SAID BARREL HAVING A DISPENSING END; A PIPETTE CONNECTOR OPERATIVELY ATTACHED TO THE DISPENSING END OF THE BARREL; SPRING MEANS DISPOSED IN THE BARREL AND ADAPTED TO RESILIENTLY URGE THE PLUNGER OUT OF THE BARREL; A CHANNEL FORMED LONGITUDINALLY THROUGH THE LENGTH OF THE PLUNGER FROM THE FINGER-ENGAGING TOP END TO THE END OPPOSITE, THEREBY TO PERMIT FINGERTIP CONTROL OF THE EMPTYING OF A PIPETTE ATTACHED TO THE DEVICE; AND A STOP MECHANISM FOR CONTROLLING RECIPROCAL MOTION OF THE PLUNGER WITH RESPECT TO THE BARREL, SAID STOP MECHANISM COMPRISING A LINEAR RATCHET FORMING AN INTEGRAL PART OF THE PLUNGER, AND A SPRING ACTUATED PAWL MOUNTED ON THE BARREL AND ADAPTED TO CONTROLLABLY ENGAGE SAID LINEAR RATCHET.
Claim 2
Dependent Claim
137 words
AN IMPROVED PIPETTING DEVICE COMPRISING: A SYRINGE HAVING AN ASSOCIATED PLUNGER AND BARREL, SAID PLUNGER HAVING A FINGER-ENGAGING TOP END AND SAID BARREL HAVING A DISPENSING END; A PIPETTE CONNECTOR OPERATIVELY ATTACHED TO THE DISPENSING END OF THE BARREL; SPRING MEANS DISPOSED IN THE BARREL AND ADAPTED TO RESILIENTLY URGE THE PLUNGER OUT OF THE BARREL; A CHANNEL FORMED LONGITUDINALLY THROUGH THE LENGTH OF THE PLUNGER FROM THE FINGER-ENGAGING TOP END TO THE END OPPOSITE, THEREBY TO PERMIT FINGERTIP CONTROL OF THE EMPTYING OF A PIPETTE ATTACHED TO THE DEVICE; AND A STOP MECHANISM FOR CONTROLLING RECIPROCAL MOTION OF THE PLUNGER WITH RESPECT TO THE BARREL, SAID STOP MECHANISM COMPRISING A LINEAR RATCHET FORMING AN INTEGRAL PART OF THE PLUNGER, AND A SPRING ACTUATED PAWL MOUNTED ON THE BARREL AND ADAPTED TO CONTROLLABLY ENGAGE SAID LINEAR RATCHET.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |