Patent US2978339A successfully refreshed from Google Patents.
US2978339A
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US
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Method of producing hollow glass spheres
Assignee: Standard Oil Co
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Filing: 1957-10-22
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Granted: 1961-04-04
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Expires: 1977-10-22
Abstract
No abstract record available.
Inventors
- 👤 Veatch Franklin
- 👤 Harvey E Alford
- 👤 Richard D Croft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:27
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/02; C04B18/027; C03; C03B; C03B19/00; C03B19/10; C03B19/107; C03B19/1075; C03C; C03C11/00; C03C11/002; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/066; C08; C08J; C08J9/00; C08J9/32; Y; Y10; Y10S; Y10S106/00; Y10S106/01; Y10S106/02; Y10S264/00; Y10S264/06; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD OF PRODUCING HOLLOW SPHERES FROM FINELY DIVIDED SOLID PARTICLES OF MATERIAL FORMING A GLASS UPON FUSION THEREOF IN ADMIXTURE WITH A COMPOUND WHICH LIBERATES A GAS AT THE TEMPERATURE OF SAID FUSION, WHICH COMPRISES PASSING A STREAM OF HOT GAS UPWARDLY THROUGH A VERTICAL FURNACE ZONE AT A TEMPERATURE TO FUSE SAID SOLID PARTICLES AND LIBERATE A GAS FROM THE SAID COMPOUND, INTRODUCING SAID SOLID PARTICLES IN THE LOWER APART OF SAID ZONE SO THAT THEY ARE PROPELLED UPWARDLY WITHIN SAID ZONE
Claim 2
Independent Claim
84 words
A METHOD OF PRODUCING HOLLOW SPHERES FROM FINELY DIVIDED SOLID PARTICLES OF MATERIAL FORMING A GLASS UPON FUSION THEREOF IN ADMIXTURE WITH A COMPOUND WHICH LIBERATES A GAS AT THE TEMPERATURE OF SAID FUSION, WHICH COMPRISES PASSING A STREAM OF HOT GAS UPWARDLY THROUGH A VERTICAL FURNACE ZONE AT A TEMPERATURE TO FUSE SAID SOLID PARTICLES AND LIBERATE A GAS FROM THE SAID COMPOUND, INTRODUCING SAID SOLID PARTICLES IN THE LOWER APART OF SAID ZONE SO THAT THEY ARE PROPELLED UPWARDLY WITHIN SAID ZONE
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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) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |