US3674461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow spherical articles
Assignee: Canadian Patents and Development Ltd
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Filing: 1970-05-21
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Granted: 1972-07-04
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Expires: 1990-05-21
Abstract
Abstract HOLLOW ARTICLES FREE OF HOLES OR SEAMS OF A METAL SELECTED FROM ALUMINUM, MAGNESIUM, BORON, AND BERYLLIUM ARE PROVIDED BY COATING A SHAPED CORE OF A MATERIAL TRANSFORMABLE DIRECTLY INTO GAS WITH FLAKES OR PARTICLES OF THE METAL, SLOWLY REMOVING THE CORE MATERIAL THROUGH THE PARTICULATE COATING IN GASEOUS FORM, AND CONSOLIDATING THE COATING (E.G. BY FUSING OR SINTERING). COATINGS OF THESE METALS CANNOT BE SATISFACTORILY PREPARED BY REDUCTION OF THEIR SALTS IN SOLUTION. SMALL SPHERES OF A DIAMETER LESS THAN 0.2 INCH (ESPECIALLY 0.005 TO 0.06 INCH) ARE OF PARTICULAR INTEREST.
Inventors
- 👤 Joseph Redmond Farnand
- 👤 Ira Edwin Puddington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:36
CPC Classifications
B; B01; B01J; B01J2/00; B22; B22F; B22F1/00; B22F1/06; B22F1/065; B22F1/0655; Y; Y10; Y10S; Y10S264/00; Y10S264/44; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S75/00; Y10S75/953; Y10T; Y10T428/00; Y10T428/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |