US4195513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of monitoring the presence or movements of humans
Assignee: PCP Inc A CORP OF FLORIDA
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Filing: 1969-06-18
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Granted: 1980-04-01
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Expires: 1989-06-18
Abstract
Abstract Methods in which humans or other mobile bodies are exposed to volatile tracking and marking substances, the vapors of which are detected by ionizing gaseous samples, analyzing the ions in a drift field, and detecting at least a portion of the ions.
Inventors
- 👤 Martin J. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:13
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/62; G01N27/622; G01N27/68
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
144 words
A method of monitoring a mobile body, which comprises exposing said body, at a first location, to a source of an unobtrusive tracking or marking substance which clings to the body in minute amounts upon contact therewith and is capable of producing an ionizable gas, thereafter collecting a gaseous sample at a second location to which the substance is carried by the body, forming ions of said substance from said gaseous sample by ion-molecule reactions, applying a DC drift field to said ions, segregating said ions in said drift field into groups in accordance with their drift velocity, and detecting at least a portion of the segregated ions of said substance, said ion forming and segregating steps being performed at a region maintained at a pressure such that the gas collision mean free path is very small compared to the dimensions of said region.
Claim 2
Independent Claim
144 words
A method of monitoring a mobile body, which comprises exposing said body, at a first location, to a source of an unobtrusive tracking or marking substance which clings to the body in minute amounts upon contact therewith and is capable of producing an ionizable gas, thereafter collecting a gaseous sample at a second location to which the substance is carried by the body, forming ions of said substance from said gaseous sample by ion-molecule reactions, applying a DC drift field to said ions, segregating said ions in said drift field into groups in accordance with their drift velocity, and detecting at least a portion of the segregated ions of said substance, said ion forming and segregating steps being performed at a region maintained at a pressure such that the gas collision mean free path is very small compared to the dimensions of said region.
Claim 3
Dependent Claim
26 words
A method in accordance with claim 1, in which said body is exposed to a substance which leaves a track recording the movements of said body.
Claim 4
Dependent Claim
18 words
A method in accordance with claim 1, in which said body is exposed to a liquid organic substance.
Claim 5
Dependent Claim
19 words
A method in accordance with claim 1, in which said body is exposed to a non-toxic, substantially odorless substance.
Claim 6
Dependent Claim
33 words
A method in accordance with claim 1, in which said body is exposed to a substance selected from the group consisting of fluoroethers and alcohols, organic phosphites, organic nitrates, and organic sulfur compounds.
Claim 7
Dependent Claim
36 words
A method in accordance with claim 1, in which said body is exposed to a substance selected from the group consisting of aliphatic and aromatic esters, ethers, ketones, aldehydes, amine, alcohols; halocarbons; nitrocarbons; sulphocarbons; and phosphocarbons.
Claim 8
Dependent Claim
21 words
A method in accordance with claim 1, in which said body is exposed to a substance selected from Table I herein.
Claim 9
Dependent Claim
22 words
A method in accordance with claim 1, in which said substance is a substance capable of being absorbed by leather or rubber.
Claim 10
Dependent Claim
15 words
A method in accordance with claim 1, in which said body is a human body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |