US3309188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for manufacturing pipettes
Assignee: OI Glass Inc
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Filing: 1963-09-03
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Granted: 1967-03-14
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Expires: 1983-09-03
Abstract
No abstract record available.
Inventors
- 👤 Charles A Porter
- 👤 Wilbur A Schreiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:02
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/04; C03B23/07
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A METHOD OF FORMING A PIPETTE FROM A LENGTH OF GLASS TUBING COMPRISING, THE STEPS OF SUPPORTING THE TUBE AT THE ENDS ONLY AND ROTATING SAID LENGTH OF TUBING ABOUT ITS LONGITUDINAL AXIS, APPLYING HEAT TO A PREDETERMINED LENGTH OF SAID TUBING TO RENDER A CIRCUMFERENTIAL PORTION THEREOF PLASTIC, MOVING A PAIR OF OPPOSED CONVACE MEMBERS INTO CLOSE PROXIMITY TO THE HEATED PORTION OF SAID TUBING, EXPANDING THE HEATED PORTION AGAINST THE MEMBERS BY INTRODUCING AIR AT A CONTROLLED PRESSURE INTO THE TUBING, DISCONTINUING THE INTRODUCTION OF AIR INTO THE PIPETTE AFTER EXPANSION IS COMPLETE, MOVING THE CONCAVE MEMBERS APART AND REMOVING THE FORMED PIPETTE.
Claim 2
Independent Claim
105 words
A METHOD OF FORMING A PIPETTE FROM A LENGTH OF GLASS TUBING COMPRISING, THE STEPS OF SUPPORTING THE TUBE AT THE ENDS ONLY AND ROTATING SAID LENGTH OF TUBING ABOUT ITS LONGITUDINAL AXIS, APPLYING HEAT TO A PREDETERMINED LENGTH OF SAID TUBING TO RENDER A CIRCUMFERENTIAL PORTION THEREOF PLASTIC, MOVING A PAIR OF OPPOSED CONVACE MEMBERS INTO CLOSE PROXIMITY TO THE HEATED PORTION OF SAID TUBING, EXPANDING THE HEATED PORTION AGAINST THE MEMBERS BY INTRODUCING AIR AT A CONTROLLED PRESSURE INTO THE TUBING, DISCONTINUING THE INTRODUCTION OF AIR INTO THE PIPETTE AFTER EXPANSION IS COMPLETE, MOVING THE CONCAVE MEMBERS APART AND REMOVING THE FORMED PIPETTE.
Claim 3
Dependent Claim
225 words
APPARATUS FOR FORMING A PIPETTE FROM A LENGTH OF GLASS TUBING COMPRISING, MEANS FOR MOUNTING THE GLASS TUBE ONLY AT THE ENDS THEREOF, MEANS FOR ROTATING SAID LENGTH OF TUBING ABOUT ITS LONGITUDINA LAXIS IN A HORIZONTAL PLANE, A PAIR OF CONCAVE ROLLER DIES, MEANS MOUNTING SAID ROLLER DIES FOR ROTATION ABOUT THEIR AXES AND WITH THEIR AXES PARALLEL TO AND ON OPPOSITE SIDES OF THE AXIS OF THE TUBING, MEANS SUPPORTING SAID DIE MOUNTING MEANS FOR MOVEMENT TOWARD AND AWAY FROM EACH OTHER, MEANS CONNECTED TO SAID DIES FOR ROTATING SAME AT THE SAME PERIPHERAL VELOCITY AND IN THE SAME DIRECTION, MEANS CONNECTED BETWEEN SAID DIE SUPPORTING MEANS FOR BIASING SAME TOWARD EACH OTHER, MEANS POSITIONED BETWEEN SAID DIE SUPPORTING MEANS FOR CONTROLLING THE MOVEMENT OF SAID DIES TOWARD AND AWAY FROM EACH OTHER AND INT O CLOSE PROXIMITY TO SAID TUBING, A MOTOR CONNECTED TO SAID MEANS FOR CONTROLLING THE MOVEMENT OF HE DIES MEANS ASSOCIATED WITH SAID DIE MOUNTING MEANS FOR LIMITNG MOVEMENT OF SAID DIES TOWARD EACH OTHER, A HEATER POSITIONED BENEATH THE TUBING FOR HEATING THE TUBING IN THE AREA BETWEEN THE ROLLER DIES AND MEANS IN ENGAGEMENT WITH ONE END OF SAID TUBING FOR INTRODUCING FLUID INTO THE INTERIOR OF SAID TUBING UNDER A CONTROLLED PRESSURE TO EXPAND SAID HEATED AREA INTO ENGAGING AND FORMING RELATION WITH SAID DIES.
Claim 4
Dependent Claim
225 words
APPARATUS FOR FORMING A PIPETTE FROM A LENGTH OF GLASS TUBING COMPRISING, MEANS FOR MOUNTING THE GLASS TUBE ONLY AT THE ENDS THEREOF, MEANS FOR ROTATING SAID LENGTH OF TUBING ABOUT ITS LONGITUDINA LAXIS IN A HORIZONTAL PLANE, A PAIR OF CONCAVE ROLLER DIES, MEANS MOUNTING SAID ROLLER DIES FOR ROTATION ABOUT THEIR AXES AND WITH THEIR AXES PARALLEL TO AND ON OPPOSITE SIDES OF THE AXIS OF THE TUBING, MEANS SUPPORTING SAID DIE MOUNTING MEANS FOR MOVEMENT TOWARD AND AWAY FROM EACH OTHER, MEANS CONNECTED TO SAID DIES FOR ROTATING SAME AT THE SAME PERIPHERAL VELOCITY AND IN THE SAME DIRECTION, MEANS CONNECTED BETWEEN SAID DIE SUPPORTING MEANS FOR BIASING SAME TOWARD EACH OTHER, MEANS POSITIONED BETWEEN SAID DIE SUPPORTING MEANS FOR CONTROLLING THE MOVEMENT OF SAID DIES TOWARD AND AWAY FROM EACH OTHER AND INT O CLOSE PROXIMITY TO SAID TUBING, A MOTOR CONNECTED TO SAID MEANS FOR CONTROLLING THE MOVEMENT OF HE DIES MEANS ASSOCIATED WITH SAID DIE MOUNTING MEANS FOR LIMITNG MOVEMENT OF SAID DIES TOWARD EACH OTHER, A HEATER POSITIONED BENEATH THE TUBING FOR HEATING THE TUBING IN THE AREA BETWEEN THE ROLLER DIES AND MEANS IN ENGAGEMENT WITH ONE END OF SAID TUBING FOR INTRODUCING FLUID INTO THE INTERIOR OF SAID TUBING UNDER A CONTROLLED PRESSURE TO EXPAND SAID HEATED AREA INTO ENGAGING AND FORMING RELATION WITH SAID DIES.
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |