Patent US4238436A successfully refreshed from Google Patents.
US4238436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of obtaining polycrystalline silicon
Assignee: Arris Technology Inc
•
Filing: 1979-05-10
•
Granted: 1980-12-09
•
Expires: 1999-05-10
Abstract
Abstract Polycrystalline silicon is obtained by providing a silicon wafer having disposed over at least one face thereof a base coating of oxide, nitride or oxynitride composition, forming a substantially pinhole-free and scratch-free layer of carbon on said base coating over at least the face, forming on the face of the carbon layer a layer of polycrystalline silicon, and removing the silicon layer from the protective coating. Any of the carbon layer adhering to the silicon layer is easily removable to provide the silicon layer separate from the substrate. The wafer/coating unit is reusable in the procedure. The wafer/coating/carbon layer unit comprises a workpiece useful in the practice of the invention.
Inventors
- 👤 Lawrence R. Hill
- 👤 Dennis Garbis
- 👤 Robert Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:44
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/01; Y; Y10; Y10S; Y10S117/00; Y10S117/915
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
A method of obtaining polycrystalline silicon comprising the steps of: A. providing a substrate body having a substantially planar face and a sidewall, said substrate body having disposed over at least said face thereof a base coating of a composition selected from the group consisting of oxide, nitride and oxynitride compositions; B. forming a substantially pinhole-free and scratch-free layer of carbon on said base coating over at least the face thereof; C. forming a layer of polycrystalline silicon on the face of said carbon layer; and D. removing said silicon layer from said base coating.
Claim 2
Independent Claim
95 words
A method of obtaining polycrystalline silicon comprising the steps of: A. providing a substrate body having a substantially planar face and a sidewall, said substrate body having disposed over at least said face thereof a base coating of a composition selected from the group consisting of oxide, nitride and oxynitride compositions; B. forming a substantially pinhole-free and scratch-free layer of carbon on said base coating over at least the face thereof; C. forming a layer of polycrystalline silicon on the face of said carbon layer; and D. removing said silicon layer from said base coating.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein said base coating is disposed at least over said substrate body face and the sidewall thereof, and said carbon layer is disposed at least over said base coating face and the sidewall thereof.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein said base coating encloses the entire surface of said substrate body.
Claim 5
Dependent Claim
32 words
The method of claim 2 including the additional steps of E. removing any of said carbon layer adhering to said base coating face; and F. repeating at least steps B through D.
Claim 6
Dependent Claim
13 words
The method of claim 4 wherein in step (F) steps (B)-(E) are repeated.
Claim 7
Dependent Claim
35 words
The method of claim 5 wherein in step (F) steps (B)-(E) are repeated a plurality of times until said base coating deteriorates, at which point said base coating is reconstituted and steps (B)-(E) are repeated.
Claim 8
Dependent Claim
24 words
The method of claim 2 additionally including the step of removing any of said carbon layer adhering to said silicon layer after step (D).
Claim 9
Dependent Claim
23 words
The method of claim 2 wherein in step (D) a thin object is wedged intermediate said silicon layer and said base coating face.
Claim 10
Dependent Claim
27 words
The method of claim 8 wherein in step (D) said thin object is inserted immediately below the portion of said silicon layer abutting said carbon layer face.
Claim 11
Dependent Claim
27 words
The method of claim 2 wherein in step (B) said carbon layer is deposited by exposing said base coating face and sidewall to fumes of ignited xylene.
Claim 12
Dependent Claim
26 words
The method of claim 2 wherein in step (B) said carbon layer is deposited by heating and exposing to xylene said base coating face and sidewall.
Claim 13
Dependent Claim
20 words
The method of claim 2 wherein said silicon layer is formed on said carbon layer face by chemical vapor deposition.
Claim 14
Dependent Claim
13 words
The method of claim 2 wherein said substrate body face is highly polished.
Claim 15
Dependent Claim
14 words
The method of claim 13 wherein said base coating is substantially pinhole-free and scratch-free.
Claim 16
Dependent Claim
14 words
The method of claim 2 wherein said base coating is substantially pinhole-free and scratch-free.
Claim 17
Dependent Claim
18 words
The method of claim 2 wherein said carbon layer on said base coating face is of uniform thickness.
Claim 18
Dependent Claim
13 words
The method of claim 2 wherein said substrate body is formed of silicon.
References Cited (Backward Citations)
US3686378A
Cited
US3867497A
Cited
US4027053A
Cited
US4065533A
Cited
US4131659A
Cited
US4141764A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |