US2976574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical process and product
Assignee: Union Carbide Corp
•
Filing: 1956-07-31
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Granted: 1961-03-28
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Expires: 1976-07-31
Abstract
No abstract record available.
Inventors
- 👤 William A Keutgen
- 👤 Charles R Davall
- 👤 Rupert S Daniels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:57
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; B; B01; B01J; B01J2/00; B01J2/16; B29; B29B; B29B13/00; B29B13/02; B29B13/021; B29B9/00; C08J2361/00; C08J2361/04; C08J2361/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A PROCESS WHICH COMPRISES PROPELLING AND DISPERSING DRY, GROUND, FUSIBLE HEAT-HARDENABLE PHENOL-ALDEHYDE RESIN PARTICLES BY MEANS OF A COOL, TURBULENT SUBSTANTIALLY INERT GAS FEED FUNCTIONING AT A TEMPERATURE SUBSTANTIALLY BELOW THE MELTING POINT OF THE SAID RESIN INTO A MIXING CHAMBER AT ONE END THEREOF AND AT WHICH POINT THEREIN THE SAID PARTICLES ARE ENTRAINED IN A HOT TURBULENT SUBSTANTIALLY INERT GAS STREAM THE TEMPERATURE OF WHICH IS ABOVE THE MELTING POINT OF THE RESIN AND HEAT POLISHED TO FORM SPHERES THE HEAT AND TIME OF ENTRAINMENT BEING INSUFFICIENT TO CAUSE APPRECIABLE ADVANCEMENT OF THE RESIN, SAID SPHERES PASSING TO THE PERIPHERY AND OPPOSITE END OF SAID CHAMBER WHEREIN A COUNTERROTATING COOL, TURBULENT, SUBSTANTIALLY INERT GAS OF A TEMPERATURE SUBSTANTIALLY BELOW THE POINT OF MELTING OF SAID RESIN IS AGAIN SUPPLIED TO SAID CHAMBER AND ENTRAINING AND COOLING SAID SPHERES THEREIN TO FORM FUSIBLE, ROUNDED MICROSPHERES.
Claim 2
Dependent Claim
146 words
A PROCESS WHICH COMPRISES PROPELLING AND DISPERSING DRY, GROUND, FUSIBLE HEAT-HARDENABLE PHENOL-ALDEHYDE RESIN PARTICLES BY MEANS OF A COOL, TURBULENT SUBSTANTIALLY INERT GAS FEED FUNCTIONING AT A TEMPERATURE SUBSTANTIALLY BELOW THE MELTING POINT OF THE SAID RESIN INTO A MIXING CHAMBER AT ONE END THEREOF AND AT WHICH POINT THEREIN THE SAID PARTICLES ARE ENTRAINED IN A HOT TURBULENT SUBSTANTIALLY INERT GAS STREAM THE TEMPERATURE OF WHICH IS ABOVE THE MELTING POINT OF THE RESIN AND HEAT POLISHED TO FORM SPHERES THE HEAT AND TIME OF ENTRAINMENT BEING INSUFFICIENT TO CAUSE APPRECIABLE ADVANCEMENT OF THE RESIN, SAID SPHERES PASSING TO THE PERIPHERY AND OPPOSITE END OF SAID CHAMBER WHEREIN A COUNTERROTATING COOL, TURBULENT, SUBSTANTIALLY INERT GAS OF A TEMPERATURE SUBSTANTIALLY BELOW THE POINT OF MELTING OF SAID RESIN IS AGAIN SUPPLIED TO SAID CHAMBER AND ENTRAINING AND COOLING SAID SPHERES THEREIN TO FORM FUSIBLE, ROUNDED MICROSPHERES.
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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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |