Patent US2586959A successfully refreshed from Google Patents.
US2586959A
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Delay electric blasting cap
Assignee: PPG Architectural Coatings Canada Inc
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Filing: 1949-09-16
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Granted: 1952-02-26
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Expires: 1969-09-16
Abstract
No abstract record available.
Inventors
- 👤 Kerr Hugh Mowat
- 👤 Richardson William George
- 👤 Logan Hector Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:24
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/16; Y; Y10; Y10S; Y10S149/00; Y10S149/11; Y10S149/114
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN A DELAY ELECTRIC BLASTING CAP, A FINELY DIVIDED INORGANIC DELAY COMPOSITION CONSISTING ESSENTIALLY OF 70-75% BY WEIGHT OF RED LEAD, 30-12% BY WEIGHT OF SILICON AND 0-18% BY WEIGHT, OF SILICON DIOXIDE, SAID RED LEAD AND SILICON BEING OF SUFFICIENTLY FINE PARTICLE SIZE AS TO PASS A 250 MESH SCREEN.
Claim 2
Dependent Claim
51 words
IN A DELAY ELECTRIC BLASTING CAP, A FINELY DIVIDED INORGANIC DELAY COMPOSITION CONSISTING ESSENTIALLY OF 70-75% BY WEIGHT OF RED LEAD, 30-12% BY WEIGHT OF SILICON AND 0-18% BY WEIGHT, OF SILICON DIOXIDE, SAID RED LEAD AND SILICON BEING OF SUFFICIENTLY FINE PARTICLE SIZE AS TO PASS A 250 MESH SCREEN.
References Cited (Backward Citations)
US763666A
Cited
US1999820A
Cited
US1877127A
Cited
US2123691A
Cited
GB575476A
Cited
US2434067A
Cited
US2497387A
Cited
US2513391A
Cited
US2416639A
Cited
US2410801A
Cited
US2478501A
Cited
US2560452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |