US4381159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic fingerprint dusting brush
Assignee: SIRCHIE FINGERPRINT LABORATORIES UMSTEAD INDUSTRIAL PARK
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Filing: 1980-11-12
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Granted: 1983-04-26
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Expires: 2000-11-12
Abstract
Abstract A magnetic fingerprint dusting brush comprising a handle (10) incorporating a projecting magnet (14) at one end, and a powder cartridge which is a push fit onto the handle, said cartridge comprising a shroud (16), which includes an inner blind sleeve (18) which extends coaxially from an inner cylindrical sleeve (20) of larger diameter, whereby the section (18) receives the magnet (14) and section (20) receives the lower end of the handle (10) when the cartridge is fitted in place on the handle, and a cap (24) which assembles with the shroud (16) to form a reservoir around the shrouded magnet containing a measured quantity of ferrous powder particles (26) carrying dusting powder which align on the shrouded magnet to form a bristle like array (28) exposed when the cap (24) is removed.
Inventors
- 👤 John M. Payne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:10
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/117; A61B5/1171; A61B5/1172
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
153 words
A magnetic fingerprint dusting brush comprising: (a) a handle which incorporates a magnet portion projecting at one end thereof; (b) a non-magnetic shroud adapted to be assembled with the handle closely to shroud the projecting magnet portion; (c) said shroud including an inner blind sleeve for closely shrouding the magnet portion and an outer sleeve to which a cover is adapted to be detachably secured; (d) said inner sleeve having a first portion of greater cross-section for assembly with the handle and a coaxial second portion of lesser cross-section connected to the first portion through a shoulder for closely shrouding the magnet portion; (e) a cover detachably securable to the handle/shroud assembly to form in its secured position an enclosed powder reservoir around the shrouded magnet portion; (f) said shroud and cover constituting a powder cartridge for assembly with the handle; and (g) a mixture of ferrous and dusting powder in the reservoir.
Claim 2
Dependent Claim
153 words
A magnetic fingerprint dusting brush comprising: (a) a handle which incorporates a magnet portion projecting at one end thereof; (b) a non-magnetic shroud adapted to be assembled with the handle closely to shroud the projecting magnet portion; (c) said shroud including an inner blind sleeve for closely shrouding the magnet portion and an outer sleeve to which a cover is adapted to be detachably secured; (d) said inner sleeve having a first portion of greater cross-section for assembly with the handle and a coaxial second portion of lesser cross-section connected to the first portion through a shoulder for closely shrouding the magnet portion; (e) a cover detachably securable to the handle/shroud assembly to form in its secured position an enclosed powder reservoir around the shrouded magnet portion; (f) said shroud and cover constituting a powder cartridge for assembly with the handle; and (g) a mixture of ferrous and dusting powder in the reservoir.
Claim 3
Dependent Claim
25 words
A magnetic fingerprint dusting brush according to claim 1, and further comprising a powder guard on the inner sleeve in the region of said shoulder.
Claim 4
Dependent Claim
23 words
A magnetic fingerprint dusting brush according to claim 1 wherein the shroud and cover or cap are both formed entirely of non-magnetisable material.
Claim 5
Dependent Claim
95 words
A magnetic fingerprint dusting brush comprising: (a) a non-magnetic handle fitted with a projecting cylindrical magnet at one end; (b) a cylindrical powder cartridge for assembly with said handle around the magnet, said cartridge comprising: (i) a non-magnetic cylindrical shroud detachably securable to the handle to shroud the magnet and which is a push fit into its shrouding position around said magnet; (ii) a non-magnetic cover comprising a cylindrical cap detachably securable to the shroud to form therewith an enclosed powder reservoir around the shrouded magnet and which is a powder-tight fit on said shroud.
Claim 6
Dependent Claim
95 words
A magnetic fingerprint dusting brush comprising: (a) a non-magnetic handle fitted with a projecting cylindrical magnet at one end; (b) a cylindrical powder cartridge for assembly with said handle around the magnet, said cartridge comprising: (i) a non-magnetic cylindrical shroud detachably securable to the handle to shroud the magnet and which is a push fit into its shrouding position around said magnet; (ii) a non-magnetic cover comprising a cylindrical cap detachably securable to the shroud to form therewith an enclosed powder reservoir around the shrouded magnet and which is a powder-tight fit on said shroud.
Claim 7
Dependent Claim
20 words
A magnetic fingerprint dusting brush according to claim 4, wherein the cap is a screw fit on to the shroud.
Claim 8
Dependent Claim
33 words
A magnetic fingerprint dusting brush according to claim 5, wherein the shroud has an inner sleeve for shrouding the magnet and an externally screwthreaded outer sleeve for cooperating with an internally screwthreaded cap.
Claim 9
Dependent Claim
41 words
A magnetic fingerprint dusting brush according to claim 6, wherein the inner sleeve of the shroud has a portion of greater diameter which is a push fit on the handle and a portion of lesser diameter for shrouding the projecting magnet.
References Cited (Backward Citations)
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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) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |