US3914360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion of expandable synthetic resinous microspheres
Assignee: PIERCE & STEVENS CHEMICAL Corp
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Filing: 1973-04-23
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Granted: 1975-10-21
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Expires: 1993-04-23
Abstract
Abstract Expandable synthetic resinous microspheres are expanded in a liquid matrix by passing a dispersion of microspheres in the liquid matrix through an interfacial surface generator.
Inventors
- 👤 Roland E Gunderman
- 👤 Jr Ritchey O Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:20
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; B; B01; B01J; B01J13/00; B01J13/02; B01J13/20; Y; Y10; Y10S; Y10S264/00; Y10S264/06; Y10S264/09; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
IN A METHOD FOR THE EXPANSION OF SYNTHETIC RESINOUS MICROSPHERES, THE STEPS OF THE METHOD COMPRISING PROVIDING A PLURALITY OF EXPANDABLE SYNTHETIC RESINOUS THERMOPLASTIC MICROSPHERES IN ASSOCATION WITH A LIQUID DISPERSING MEDIUM WHEREIN THE MICROSPHERE/DISPERSING MEDIUM MIXTURES IS FLOWABLE UNDER PRESSURE WHEREIN THE CONCENTRATION OF EXPANDABLE MICROSPHERE IN THE DISPERSING MEDUM IS FROM ABOUT 7 TO ABOUT 30 VOLUME PERCENT, HEATING THE MIXTURE OF DISPERSING MEDIUM AND MICROSPHERES TO A TEMPERATURE SUFFICIENT TO CAUSE EXPANSION OF THE SYTHETIC RESINOUS THERMOPLASTIC MICROSPHERES TO FORM A PLURALITY OF MONOCELLULAR GAS-FILLED SYNTHETIC RESINOUS PARTICALES, THE IMPROVEMENT WHICH COMPRISES HEATING THE MICROSPHERES BY PASSING THE DISPERSING MEDIUM/EXPANDABLE MICROSPHERE MIXTURE THROUGH A HEATED INTERFACIAL SURFACE GENERATOR.
Claim 2
Dependent Claim
111 words
IN A METHOD FOR THE EXPANSION OF SYNTHETIC RESINOUS MICROSPHERES, THE STEPS OF THE METHOD COMPRISING PROVIDING A PLURALITY OF EXPANDABLE SYNTHETIC RESINOUS THERMOPLASTIC MICROSPHERES IN ASSOCATION WITH A LIQUID DISPERSING MEDIUM WHEREIN THE MICROSPHERE/DISPERSING MEDIUM MIXTURES IS FLOWABLE UNDER PRESSURE WHEREIN THE CONCENTRATION OF EXPANDABLE MICROSPHERE IN THE DISPERSING MEDUM IS FROM ABOUT 7 TO ABOUT 30 VOLUME PERCENT, HEATING THE MIXTURE OF DISPERSING MEDIUM AND MICROSPHERES TO A TEMPERATURE SUFFICIENT TO CAUSE EXPANSION OF THE SYTHETIC RESINOUS THERMOPLASTIC MICROSPHERES TO FORM A PLURALITY OF MONOCELLULAR GAS-FILLED SYNTHETIC RESINOUS PARTICALES, THE IMPROVEMENT WHICH COMPRISES HEATING THE MICROSPHERES BY PASSING THE DISPERSING MEDIUM/EXPANDABLE MICROSPHERE MIXTURE THROUGH A HEATED INTERFACIAL SURFACE GENERATOR.
Claim 3
Dependent Claim
12 words
The method of claim 1 where the liquid dispersing medium is water.
Claim 4
Dependent Claim
17 words
The method of claim 2 where the synthetic resinous microspheres have a shell of vinylidene chloride polymer.
References Cited (Backward Citations)
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US3615972A
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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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |