Patent US4576808A successfully refreshed from Google Patents.
US4576808A
Expired / Lapsed
US
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Quartz growth on X-seeds
Assignee: United States Department of the Air Force
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Filing: 1983-12-28
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Granted: 1986-03-18
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Expires: 2003-12-28
Abstract
Abstract This invention concerns itself with a method for producing single crystal, seed material for use in growing synthetic quartz crystals. This seed material comprises a Z-faced seed crystal cut or sliced from the X-plus growing region of a synthetic quartz, single crystal boule.
Inventors
- 👤 Alton F. Armington
- 👤 John J. Larkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:05
CPC Classifications
C; C30; C30B; C30B7/00; C30B29/00; C30B29/10; C30B29/16; C30B29/18; Y; Y10; Y10S; Y10S117/00; Y10S117/901; Y10S117/902
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
219 words
A method for producing a substantially dislocation-free crystal seed material for use in the growing synthetic quartz, single crystal boules which comprises the steps of: (A) providing a synthetic quartz, single crystal boule with its length directed along a crystallographic Y-axis orientation, its width directed along a crystallographic Y-axis orientation, its thickness directed along a crystallographic Z-axis orientation and wherein said Z-axis defines a Z region of crystal growth and said X-axis defines an X-minus and an X-plus region of crystal growth; (B) slicing and removing the X-plus region of growth from said crystal boule; (C) slicing a plurality of seed crystals from said X-plus region of growth such that each of said seed crystals displays a substantially rectangular prism configureation having (1) two oppositely disposed and parallel Z face surfaces running perpendicular to the Z axis orientation and along the longitudinal direction of the rectangular prism, (2) a first edge surface running perpendicular to the X-plus axis orientation and along the longitudinal thickness of the rectangular prism, (3) a second edge surface oppositely disposed and parallel to said first edge surface running perpendicular to the X-minus axis orientation, and (4) third and fourth oppositely disposed and parallel edge surfaces defining the longitudinal dimension of said rectangular prism and running in a direction perpendicular to said crystallographic Y-axis orientation.
Claim 2
Independent Claim
219 words
A method for producing a substantially dislocation-free crystal seed material for use in the growing synthetic quartz, single crystal boules which comprises the steps of: (A) providing a synthetic quartz, single crystal boule with its length directed along a crystallographic Y-axis orientation, its width directed along a crystallographic Y-axis orientation, its thickness directed along a crystallographic Z-axis orientation and wherein said Z-axis defines a Z region of crystal growth and said X-axis defines an X-minus and an X-plus region of crystal growth; (B) slicing and removing the X-plus region of growth from said crystal boule; (C) slicing a plurality of seed crystals from said X-plus region of growth such that each of said seed crystals displays a substantially rectangular prism configureation having (1) two oppositely disposed and parallel Z face surfaces running perpendicular to the Z axis orientation and along the longitudinal direction of the rectangular prism, (2) a first edge surface running perpendicular to the X-plus axis orientation and along the longitudinal thickness of the rectangular prism, (3) a second edge surface oppositely disposed and parallel to said first edge surface running perpendicular to the X-minus axis orientation, and (4) third and fourth oppositely disposed and parallel edge surfaces defining the longitudinal dimension of said rectangular prism and running in a direction perpendicular to said crystallographic Y-axis orientation.
Claim 3
Dependent Claim
11 words
The crystal seed material produced by the method of claim 1.
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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |