Patent US4921080A successfully refreshed from Google Patents.
US3576752A
Expired / Lapsed
US
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Chemiluminescent smokes
Assignee: Ethyl Corp
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Filing: 1967-06-29
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Granted: 1971-04-27
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Expires: 1987-06-29
Abstract
Abstract CHEMILUMINESCENT SMOKE, THAT IS, A SMOKE VISIBLE BOTH BY DAY AND NIGHT, IS PRODUCED WHEN A COMPOSITION CONSISTING ESSENTIALLY OF (A) AN ALUMINUM ALKYL, (B) AN ETHER OR AN AMINE COMPLEXING AGENTS, AND (C) A PYRROLE, IS CONTACTED WITH AIR AND WATER.
Inventors
- 👤 Urho Albert Lehikoinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:43
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06; C09K11/07; C06; C06D; C06D3/00
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |