Patent US2797201A successfully refreshed from Google Patents.
US2797201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing hollow particles and resulting product
Assignee: Standard Oil Co
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Filing: 1953-10-02
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Granted: 1957-06-25
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Expires: 1973-10-02
Abstract
No abstract record available.
Inventors
- 👤 Veatch Franklin
- 👤 Ralph W Burhans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:47
CPC Classifications
C; C03; C03C; C03C11/00; C03C11/002; C03B; C03B19/00; C03B19/10; C03B19/107; C03B19/1075; C04; C04B; C04B18/00; C04B18/02; C04B18/027; C08; C08J; C08J9/00; C08J9/32; Y; Y10; Y10S; Y10S264/00; Y10S264/07; Y10S273/00; Y10S273/04; Y10S424/00; Y10S424/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A PROCESS OF FORMING HOLLOW PARTICLES FROM FILMFORMING MATERIAL, WHICH INCLUDES SUBDIVIDING INTO DROPLETS A SOLUTION COMPRISING A VOLATILE SOLVENT HAVING DISSOLVED THEREIN FILM-FORMING MATERIAL AND A MATERIAL OTHER THAN GASEOUS AT NORMAL TEMPERATURES, AND HEATING THE DROPLETS TO A TEMPERATURE CAUSING VOLATILIZATION OF THE SOLVENT TO FORM A SELF-SUPPORTING, RELATIVELY GAS-IMPERVIOUS PARTICLE WALL COINCIDENT WITH PARTICLE FORMATION AND CONVERSION OF SAID GAS-FURNISHING MATERIAL INTO A GAS THAT REMAINS GASEOUS AT NORMAL TEMPERATURES, THE AMOUNT OF SAID GAS FURNISHED WITHIN SAID FORMING PARTICLE AND WHICH IS TRAPPED BY THE PARTICLE WALL WITHIN THE SPACE THEREOF BEING SUFFICIENT TO PREVENT COLLAPSE OF THE PARTICLE WALLS UNDER THE PRESSURE OF THE SURROUNDING ATMOSPHERE IN ORDER TO FORM PARTICLES HAVING A CONTINUOUS HOLE-FREE WALL.
Claim 2
Dependent Claim
121 words
A PROCESS OF FORMING HOLLOW PARTICLES FROM FILMFORMING MATERIAL, WHICH INCLUDES SUBDIVIDING INTO DROPLETS A SOLUTION COMPRISING A VOLATILE SOLVENT HAVING DISSOLVED THEREIN FILM-FORMING MATERIAL AND A MATERIAL OTHER THAN GASEOUS AT NORMAL TEMPERATURES, AND HEATING THE DROPLETS TO A TEMPERATURE CAUSING VOLATILIZATION OF THE SOLVENT TO FORM A SELF-SUPPORTING, RELATIVELY GAS-IMPERVIOUS PARTICLE WALL COINCIDENT WITH PARTICLE FORMATION AND CONVERSION OF SAID GAS-FURNISHING MATERIAL INTO A GAS THAT REMAINS GASEOUS AT NORMAL TEMPERATURES, THE AMOUNT OF SAID GAS FURNISHED WITHIN SAID FORMING PARTICLE AND WHICH IS TRAPPED BY THE PARTICLE WALL WITHIN THE SPACE THEREOF BEING SUFFICIENT TO PREVENT COLLAPSE OF THE PARTICLE WALLS UNDER THE PRESSURE OF THE SURROUNDING ATMOSPHERE IN ORDER TO FORM PARTICLES HAVING A CONTINUOUS HOLE-FREE WALL.
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) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |