US2771033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventless delay electric initiators
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1952-08-22
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Granted: 1956-11-20
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Expires: 1972-08-22
Abstract
No abstract record available.
Inventors
- 👤 Idwal O Lewis
- 👤 Robert D J Owens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:48
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A VENTLESS SHORT DELAY ELECTRIC DETONATOR COMPRISING AN ELECTRICALLY ACTUATED IGNITING CHRAGE, AN INITIATING CHARGE AND AN INTERPOSED SHORT DELAY ELEMENT ENCLOSED IN A VENTLESS CONTAINER ESSENTIALLY OF COPPER WHEREIN THE SAID SHORT DELAY ELEMENT COMPRISES A CUT-OFF LENGTH OF FUSE COMPRISING A FLEXIBLE TEXTILE ENVELOPE AROUND A CORE COMPRISING A DRY CRUMBLY GRAPHITE-GLAZED NITROCELLULOSE BONDED GRANULAR MIXTURE OF SILICON AND RED LEAD, SAID RED LEAD BEING IN AMOUNT OF FROM ABOUT 65% TO 95% BY WEIGHT, THE SILICON IN AMOUNT OF FROM ABOUT 5% TO 35% BY WEIGHT, AND THE NITROCELLULOSE IN AMOUNT UP TO ABOUT 5% BY WEIGHT OF THE RED LEAD AND SILICON.
Claim 2
Dependent Claim
106 words
A VENTLESS SHORT DELAY ELECTRIC DETONATOR COMPRISING AN ELECTRICALLY ACTUATED IGNITING CHRAGE, AN INITIATING CHARGE AND AN INTERPOSED SHORT DELAY ELEMENT ENCLOSED IN A VENTLESS CONTAINER ESSENTIALLY OF COPPER WHEREIN THE SAID SHORT DELAY ELEMENT COMPRISES A CUT-OFF LENGTH OF FUSE COMPRISING A FLEXIBLE TEXTILE ENVELOPE AROUND A CORE COMPRISING A DRY CRUMBLY GRAPHITE-GLAZED NITROCELLULOSE BONDED GRANULAR MIXTURE OF SILICON AND RED LEAD, SAID RED LEAD BEING IN AMOUNT OF FROM ABOUT 65% TO 95% BY WEIGHT, THE SILICON IN AMOUNT OF FROM ABOUT 5% TO 35% BY WEIGHT, AND THE NITROCELLULOSE IN AMOUNT UP TO ABOUT 5% BY WEIGHT OF THE RED LEAD AND SILICON.
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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) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |