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US5051334A
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Solid imaging method using photohardenable compositions containing hollow spheres
Assignee: DSM IP Assets BV
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Filing: 1989-04-21
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Granted: 1991-09-24
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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 which is a thermal insulator and having a different index of refraction from the liquid.
Inventors
- 👤 Roxy N. Fan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:53
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; C; C08; C08K; C08K7/00; C08K7/22; 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: 9
Claim 1
Independent Claim
157 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 comprising hollow spheres, the deflecting matter having a first index of refraction, the rest of the composition 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 different than zero; and (e) successively repeating steps (c) and (d) until the three dimensional object is complete.
Claim 2
Independent Claim
157 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 comprising hollow spheres, the deflecting matter having a first index of refraction, the rest of the composition 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 different than zero; and (e) successively repeating steps (c) and (d) until the three dimensional object is complete.
Claim 3
Dependent Claim
28 words
The method of claim 1, wherein the absolute value of the difference between the first index of refraction and the second index of refraction is greater than 0.02.
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
15 words
The method of claim 1, wherein the hollow spheres are glass spheres containing a gas.
Claim 7
Dependent Claim
15 words
The method of claim 1, wherein the hollow spheres are ceramic spheres containing a gas.
Claim 8
Dependent Claim
27 words
The method of claim 1, wherein the specific gravity of the radiation deflecting matter is within ±10% of the specific gravity of the rest of the composition.
Claim 9
Dependent Claim
11 words
A rigid solid object made with the method of claim 1.
References Cited (Backward Citations)
US4137081A
Cited
JPS5713610A
Cited
JPS57135839A
Cited
BE898289A
Cited
US4504565A
Cited
US4575330A
Cited
US4575330B1
Cited
EP0234347A1
Cited
EP0250121A2
Cited
EP0257984A2
Cited
US4752498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-23 | 1995-03-25 | 1995-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-23 | 1999-03-25 | 1999-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-23 | 2003-03-25 | 2003-09-24 | $7700.00 | Window Closed / Lapsed |