Patent US5002855A successfully refreshed from Google Patents.
US5002855A
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Solid imaging method using multiphasic photohardenable compositions
Assignee: Covestro Desotech Inc
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Filing: 1989-04-21
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Granted: 1991-03-26
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Expires: 2009-04-21
Abstract
Abstract An integral three-dimensional object is formed from a photohardenable liquid composition containing radiation deflecting matter.
Inventors
- 👤 Roxy N. Fan
- 👤 Abraham B. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:01
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; B; B29; B29C; B29C64/00; B29C64/10; B29C64/106; B29C64/124; B29C64/129; B29C64/135; B29C70/00; B29C70/58; B29C70/64; G03C; G03C9/00; G03C9/08; G03F7/0037; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0833; B29C2035/0838; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/148
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
170 words
A method for accurately fabricating an integral three-dimensional object from successive layers of a photohardenable liquid composition comprising the steps of: (a) forming a layer of a photohardenable liquid; (b) photohardening at least a portion of the layer of photohardenable liquid by exposure to actinic radiation; (c) introducing a new layer of photohardenable liquid onto the layer previously exposed to actinic radiation; and (d) photohardening at least a portion of the new liquid layer by exposure to actinic radiation, with the requirement that the photohardenable composition comprises an ethylenically unsaturated monomer, photoinitiator, and radiation deflecting matter selected from the group consisting of an emulsified liquid, a solid which is substantially insoluble in the photohardenable composition and combination thereof, the deflecting matter deflecting the actinic radiation and having a first index of refraction, the remainder of the composition except for the deflecting matter having a second index of refraction, the absolute value of the difference between the first index of refraction and the second index of refraction being greater than 0.01.
Claim 2
Independent Claim
170 words
A method for accurately fabricating an integral three-dimensional object from successive layers of a photohardenable liquid composition comprising the steps of: (a) forming a layer of a photohardenable liquid; (b) photohardening at least a portion of the layer of photohardenable liquid by exposure to actinic radiation; (c) introducing a new layer of photohardenable liquid onto the layer previously exposed to actinic radiation; and (d) photohardening at least a portion of the new liquid layer by exposure to actinic radiation, with the requirement that the photohardenable composition comprises an ethylenically unsaturated monomer, photoinitiator, and radiation deflecting matter selected from the group consisting of an emulsified liquid, a solid which is substantially insoluble in the photohardenable composition and combination thereof, the deflecting matter deflecting the actinic radiation and having a first index of refraction, the remainder of the composition except for the deflecting matter having a second index of refraction, the absolute value of the difference between the first index of refraction and the second index of refraction being greater than 0.01.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein steps (c) and (d) are successively repeated.
Claim 4
Dependent Claim
16 words
The method of claim 2, wherein the actinic radiation is in the form of a beam.
Claim 5
Dependent Claim
12 words
The method of claim 3, wherein the beam is a laser beam.
Claim 6
Dependent Claim
13 words
The method of claim 2, wherein the deflecting matter is an emulsified liquid.
Claim 7
Dependent Claim
13 words
The method of claim 2, wherein the deflecting matter is a dispersed solid.
Claim 8
Dependent Claim
15 words
The method of claim 2, wherein the dispersed solid comprises a particulate organic polymeric compound.
Claim 9
Dependent Claim
14 words
The method of claim 2, wherein the dispersed solid comprises a particulate inorganic compound.
Claim 10
Dependent Claim
13 words
The method of claim 2, wherein the inorganic compound contains chemically bound oxygen.
Claim 11
Dependent Claim
28 words
The method of claim 9, wherein the inorganic compound is selected from the group consisting of oxides and hydroxides of aluminum, silicon, magnesium, zinc, zirconium, and mixtures thereof.
Claim 12
Dependent Claim
18 words
The method of claim 2 wherein the deflection matter comprises a combination of emulsified liquid and dispersed solid.
Claim 13
Dependent Claim
19 words
The method of claim 2 wherein the deflection matter has higher refractive index than the rest of the composition.
Claim 14
Dependent Claim
11 words
A three-dimensional solid part obtained by the method of claim 2.
References Cited (Backward Citations)
US4137091A
Cited
US4698373A
Cited
US4414278A
Cited
US4575330A
Cited
US4575330B1
Cited
US4726877A
Cited
US4721735A
Cited
EP0250121A2
Cited
US4752498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-03-25 | 1994-09-24 | 1995-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-25 | 1998-09-24 | 1999-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-25 | 2002-09-24 | 2003-03-26 | $7700.00 | Window Closed / Lapsed |