Patent US3331785A successfully refreshed from Google Patents.
US3331785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of microspheres of urania and other materials
Assignee: WR Grace and Co
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Filing: 1966-04-11
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Granted: 1967-07-18
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Expires: 1986-04-11
Abstract
No abstract record available.
Inventors
- 👤 Fitch Frederick Troop
- 👤 Braun Ann Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:45
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; C; C01; C01G; C01G43/00; C01G43/01; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2002/54; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/51; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR PREPARING DENSE SPHERICAL OXIDE PARTICLES HAVING DIAMETERS IN THE RANGE OF 5 TO 500 MICRONS WHICH COMPRISES DISPERSING A NON-GELLING OXIDE AQUASOL TO FORM DROPLETS OF UNIFORM SIZE AND CONCENTRATION, DRYING SAID DROPLETS OVER A PERIOD OF AT LEAST 3 SECONDS AND AT A TEMPERATURE SUFFICIENT TO MAINTAIN THEIR SPHERICAL FORM, RECOVERING THE DRIED SINTERABLE COLLOIDAL OXIDE SPHERES HAVING A VOLUME FRACTION OF WATER OF LESS THAN 55 PERCENT AND SINTERING TO HIGH DENSITY PRODUCT SPHERES.
Claim 2
Dependent Claim
79 words
A PROCESS FOR PREPARING DENSE SPHERICAL OXIDE PARTICLES HAVING DIAMETERS IN THE RANGE OF 5 TO 500 MICRONS WHICH COMPRISES DISPERSING A NON-GELLING OXIDE AQUASOL TO FORM DROPLETS OF UNIFORM SIZE AND CONCENTRATION, DRYING SAID DROPLETS OVER A PERIOD OF AT LEAST 3 SECONDS AND AT A TEMPERATURE SUFFICIENT TO MAINTAIN THEIR SPHERICAL FORM, RECOVERING THE DRIED SINTERABLE COLLOIDAL OXIDE SPHERES HAVING A VOLUME FRACTION OF WATER OF LESS THAN 55 PERCENT AND SINTERING TO HIGH DENSITY PRODUCT SPHERES.
References Cited (Backward Citations)
US3171715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |