Patent US2680068A successfully refreshed from Google Patents.
US2680068A
Expired / Lapsed
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Ammonium nitrate blasting explosives
Assignee: Imperial Chemical Industries Ltd
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Filing: 1949-04-12
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Granted: 1954-06-01
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Expires: 1969-04-12
Abstract
No abstract record available.
Inventors
- 👤 Samuel H Davidson
- 👤 Charles H Rigby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:13
CPC Classifications
C; C06; C06B; C06B31/00; C06B31/28; C06B31/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A BLASTING EXPLOSIVE COMPOSITION COMPRISING AMMONIUM NITRATE WITH AT LEAST ONE OTHER SELF-EXPLOSIVE SENSITIZING AGENT THEREFOR AND A SMALL PROPORTION OF WATER-SWELLABLE AND SOLUBLE ETHER OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF CELLULOSE AND STARCH, SAID ETHER BEING UNIFORMLY DISTRIBUTED THROUGHOUT THE COMPOSITION.
Claim 2
Dependent Claim
45 words
A BLASTING EXPLOSIVE COMPOSITION COMPRISING AMMONIUM NITRATE WITH AT LEAST ONE OTHER SELF-EXPLOSIVE SENSITIZING AGENT THEREFOR AND A SMALL PROPORTION OF WATER-SWELLABLE AND SOLUBLE ETHER OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF CELLULOSE AND STARCH, SAID ETHER BEING UNIFORMLY DISTRIBUTED THROUGHOUT THE COMPOSITION.
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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) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |