Patent US3745324A successfully refreshed from Google Patents.
US3745324A
Expired / Lapsed
US
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Target marking device
Assignee: United States Department of the Navy
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Filing: 1971-06-04
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Granted: 1973-07-10
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Expires: 1991-06-04
Abstract
Abstract A target marking device comprising a parachute or panel soaked in a chemiluminescent agent sealed inside a canister which upon rupture releases the canopy which falls to the target location where the agent reacts with oxygen in the air forming a glow visible from all quadrants, particularly at night.
Inventors
- 👤 S Shefler
- 👤 H Duff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:21
CPC Classifications
F; F42; F42B; F42B4/00; F42B4/26; F42B4/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
The device in accordance with claim 1 wherein the parachute is composed of polypropylene saturated with a chemiluminescent agent selected from the group consisting of tetrakis(dimethylamino)ethylene, tetrakis(N-pyrolidinyl)ethylene, 1, 11, 3, 31 - tetramethyl - Delta 2, 2 -bi(imidazolidine), 1, 11, 3, 31 - tetraethyl - Delta 2, 2 -bi(imidazolidine), 1, 11 - diethyl - 3, 31 - dimethyl - Delta 2, 2 -bi(amidazolidine), and tetrakis(dimethylaminomethyleneamino)ethylene.
Claim 2
Dependent Claim
45 words
The device in accordancE with claim 1 including a second partition disposed between the first partition and said plug separating the canister into two compartments, one containing a parachute saturated with a chemiluminescent agent and the other containing a parachute coated with a marking dye.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |