US4090394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic bottle testing
Assignee: OI Glass Inc
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Filing: 1976-11-03
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Granted: 1978-05-23
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Expires: 1996-11-03
Abstract
Abstract Method and apparatus are provided for producing a stress-strain type curve for evaluating the functionality of a thermoplastic bottle. The method generally comprises the steps of internally pressurizing a thermoplastic bottle with an incompressible fluid by relative movement of a piston and a cylinder, sensing the pressure of said fluid and sensing the relative movement of said piston and cylinder as said bottle is being pressurized by such movement, and graphically and automatically recording said sensed pressure and said sensed relative movement as said bottle is being pressurized. The technique is rapidly performed with high sensitivity and automatically produces a curve in which one axis is pressure related and another axis is relatable to the deformation of the bottle.
Inventors
- 👤 James N. Herman
- 👤 David M. Kaczorowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:47
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/08; G01N3/10; G01N3/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A method for producing a stress-strain type curve for evaluating the functionality of a thermoplastic bottle comprising: internally pressurizing a thermoplastic bottle with an incompressible fluid by relative movement of a piston and a cylinder, sensing the pressure of said fluid and sensing the relative movement of said piston and cylinder as said bottle is being pressurized by such movement, graphically recording said sensed pressure and said sensed relative movement as said bottle is being pressurized.
Claim 2
Independent Claim
76 words
A method for producing a stress-strain type curve for evaluating the functionality of a thermoplastic bottle comprising: internally pressurizing a thermoplastic bottle with an incompressible fluid by relative movement of a piston and a cylinder, sensing the pressure of said fluid and sensing the relative movement of said piston and cylinder as said bottle is being pressurized by such movement, graphically recording said sensed pressure and said sensed relative movement as said bottle is being pressurized.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said bottle is a biaxially oriented bottle.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein the relative movement of said piston is sensed by the movement of the slide of a slide potentiometer and a pressure transducer senses the pressure.
Claim 5
Dependent Claim
136 words
A sensitive, automatic method for testing the functionality of a thermoplastic bottle comprising: providing a thermoplastic bottle and a piston-cylinder assembly, establishing a filled, sealed fluid communication of an incompressible fluid between said assembly and the interior of said bottle, driving the piston rod of said piston so as to increase the internal pressure of said fluid in said bottle, transmitting an electrical signal which is related to the internal pressure in said bottle to a recorder, and driving a slide of a slide potentiometer as said rod is driven and transmitting an electrical signal which is related to movement of said piston to a recorder; automatically plotting said respective electrical signals with said recorder so as to provide a graph in which one axis corresponds to pressure and another axis corresponds to the piston movement.
Claim 6
Dependent Claim
136 words
A sensitive, automatic method for testing the functionality of a thermoplastic bottle comprising: providing a thermoplastic bottle and a piston-cylinder assembly, establishing a filled, sealed fluid communication of an incompressible fluid between said assembly and the interior of said bottle, driving the piston rod of said piston so as to increase the internal pressure of said fluid in said bottle, transmitting an electrical signal which is related to the internal pressure in said bottle to a recorder, and driving a slide of a slide potentiometer as said rod is driven and transmitting an electrical signal which is related to movement of said piston to a recorder; automatically plotting said respective electrical signals with said recorder so as to provide a graph in which one axis corresponds to pressure and another axis corresponds to the piston movement.
Claim 7
Independent Claim
98 words
An apparatus for testing the functionality of a thermoplastic bottle comprising: a piston and cylinder assembly in sealed fluid communication with said bottle, means for driving said piston so as to increase the internal pressure of said fluid in said bottle, means responsive to the movement of said piston for generating a piston position related electrical signal, means for providing a bottle-pressure related electrical signal and, means operatively receiving said signals and graphically presenting said signals in the form of a graph in which one axis is pressure related and another axis is related to the piston position.
Claim 8
Independent Claim
98 words
An apparatus for testing the functionality of a thermoplastic bottle comprising: a piston and cylinder assembly in sealed fluid communication with said bottle, means for driving said piston so as to increase the internal pressure of said fluid in said bottle, means responsive to the movement of said piston for generating a piston position related electrical signal, means for providing a bottle-pressure related electrical signal and, means operatively receiving said signals and graphically presenting said signals in the form of a graph in which one axis is pressure related and another axis is related to the piston position.
Claim 9
Dependent Claim
27 words
The apparatus of claim 5 wherein said means responsive to piston movement comprises a potentiometer having a voltage output which varies with the movement of said piston.
Claim 10
Dependent Claim
12 words
The improvement of claim 6 wherein said potentiometer is a slide potentiometer.
Claim 11
Dependent Claim
19 words
The improvement of claim 7 wherein the slide of said potentiometer is coupled to said piston for movement therewith.
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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) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |