US3716606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of stabilizing thermo-plastic containers
Assignee: KEMP PROD Ltd
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Filing: 1970-07-15
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Granted: 1973-02-13
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Expires: 1990-07-15
Abstract
Abstract Thermoplastic containers, particularly polyethylene, can be stabilized with desired or required control limit on volume and shape, such that they are capable of being used at temperature ranges in excess of 110*F. without appreciable or significant loss of shape or capacity. This is achieved by placing a small amount of liquid such as water within the bottle and subjecting the bottle to a microwave radiant energy field such that the liquid (water) absorbs the radiant energy and boils off into steam. The vapor generated would appear to be converted (after all water has evaporated) into superheated vapor which scours the interior of the bottle causing it to shrink and to stabilize such that under subsequent elevated heat environments (service temperatures) it is essentially stable in volume and shape.
Inventors
- 👤 P Bazett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:47
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/08; B; B29; B29C; B29C71/00; B29C71/04; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2995/00; B29K2995/0037; B29K2995/0049; B29L; B29L2031/00; B29L2031/712; B29L2031/7158; Y; Y10; Y10S; Y10S264/00; Y10S264/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
A method of dimensionally stabilizing a thermoplastic polymeric container as to capacity and shape by heating the container wherein the improvement comprises: providing a container having an internal cavity and composed of a thermoplastic polymeric material which is generally translucent to at least one frequency of microwave radiant energy, said container having a capacity greater than the capacity to which it is to be stabilized; introducing into said cavity a material consisting essentially of a liquid which is generally absorbent to such microwave energy to which said container is translucent, said liquid having a vaporization temperature greater than the primary memory temperature of the thermoplastic material and less than the plastic deformation temperature of the material, selecting a microwave radiant energy field which has a frequency which is generally absorbed by said liquid and to which the thermoplastic material is generally translucent, subjecting said container and said liquid to said field to elevate said liquid to its vaporization temperature and to vaporize said liquid, so as to heat said container to a temperature in close proximity to the vaporization temperature to establish a second memory temperature for the container above that of the first memory temperature.
Claim 2
Independent Claim
196 words
A method of dimensionally stabilizing a thermoplastic polymeric container as to capacity and shape by heating the container wherein the improvement comprises: providing a container having an internal cavity and composed of a thermoplastic polymeric material which is generally translucent to at least one frequency of microwave radiant energy, said container having a capacity greater than the capacity to which it is to be stabilized; introducing into said cavity a material consisting essentially of a liquid which is generally absorbent to such microwave energy to which said container is translucent, said liquid having a vaporization temperature greater than the primary memory temperature of the thermoplastic material and less than the plastic deformation temperature of the material, selecting a microwave radiant energy field which has a frequency which is generally absorbed by said liquid and to which the thermoplastic material is generally translucent, subjecting said container and said liquid to said field to elevate said liquid to its vaporization temperature and to vaporize said liquid, so as to heat said container to a temperature in close proximity to the vaporization temperature to establish a second memory temperature for the container above that of the first memory temperature.
Claim 3
Dependent Claim
10 words
The method of claim 1 wherein thE liquid is water.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein the thermoplastic is polyethylene.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein the liquid is water.
Claim 6
Dependent Claim
31 words
The method of claim 3 wherein the microwave radiant energy field is selected from the group of microwave energy frequencies consisting of 890 megahertz.; 940 megahertz.; 2400 megahertz; and 2500 megahertz.
Claim 7
Dependent Claim
35 words
The method of claim 4 wherein the microwave radiant energy field is selected from the group of microwave energy frequencies consisting of 890 M. Hz.; 940 M. Hz.;, 2400 M. Hz.; and 2500 M. Hz.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |