US2528406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making pyrophoric elements
Assignee: Individual
•
Filing: 1946-06-22
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Granted: 1950-10-31
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Expires: 1966-06-22
Abstract
No abstract record available.
Inventors
- 👤 Wulff John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:59
CPC Classifications
C; C06; C06C; C06C15/00; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936; Y10S428/937; Y10S428/939; Y10S428/941; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
IN THE MANUFACTURE OF SMALL-DIAMETER SPARKING FLINTS FROM PYROPHORIC RARE EARTH METAL, THE STEPS OF CASTING MOLTEN PYROPHORIC METAL INTO A TUBE OF METAL OF THE IRON GROUP, AND THEREAFTER APPLYING HEAT TO THE FILLED TUBE IN THE PRESENCE OF AN INERT PROTECTIVE COATING ON THE EXTERIOR OF THE TUBE TO EFFECT DIFFUSION AND ALLOYING BETWEEN THE PYROPHORIC METAL AND THE TUBE, THE DIFFUSION AND ALLOYING BEING CARRIED SUBSTANTIALLY TO COMPLETION TO THE PROTECTIVE INERT COATING ON TH EXTERIOR OF THE TUBE.
References Cited (Backward Citations)
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Cited
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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) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |