US3920882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-type dopant source
Assignee: OI Glass Inc
•
Filing: 1974-09-05
•
Granted: 1975-11-18
•
Expires: 1994-09-05
Abstract
Abstract Disclosed is a solid dopant source which comprises a porous, inert, rigid, dimensionally stable, refractory support impregnated with a dopant component for N-type dopants such as aluminum metaphosphate, antimony oxide or arsenic oxide.
Inventors
- 👤 Doulatabad A Venkatu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:37
CPC Classifications
C; C30; C30B; C30B31/00; C30B31/06; C30B31/16; C30B31/165; H; H10; H10P; H10P32/00; H10P32/10; H10P32/19; Y; Y10; Y10S; Y10S148/00; Y10S148/049; Y10S252/00; Y10S252/95; Y10S252/951
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
A SOLID DOPANT SOURCE FOR VAPOR PHASE TRANSPORT OF AN N-TYPE DOPANT AT ELEVATED TEMPERATURES COMPRISING A POROUS, INERT, RIGID, DIMENSIONALLY STABLE, REFRACTORY SUPPORT IMPREGNATED WITH A DOPANT COMPONENT COMPRISING ALUMINUM METAPHOSPHATE, ARSENIC OXIDE, OR ANTIMONY OXIDE, SAID DOPANT COMPONENT BEING PRESENT IN THE PROPORTION OF AT LEAST ABOUT CO20 PARTS BY WEIGHT PER 100 PARTS OF SAID SUPPORT.
Claim 2
Dependent Claim
59 words
A SOLID DOPANT SOURCE FOR VAPOR PHASE TRANSPORT OF AN N-TYPE DOPANT AT ELEVATED TEMPERATURES COMPRISING A POROUS, INERT, RIGID, DIMENSIONALLY STABLE, REFRACTORY SUPPORT IMPREGNATED WITH A DOPANT COMPONENT COMPRISING ALUMINUM METAPHOSPHATE, ARSENIC OXIDE, OR ANTIMONY OXIDE, SAID DOPANT COMPONENT BEING PRESENT IN THE PROPORTION OF AT LEAST ABOUT CO20 PARTS BY WEIGHT PER 100 PARTS OF SAID SUPPORT.
Claim 3
Dependent Claim
20 words
The dopant source of claim 1 wherein said support has been formed by compacting and sintering a refractory oxide powder.
Claim 4
Dependent Claim
13 words
The dopant source of claim 2 wherein said refractory oxide powder is alumina.
Claim 5
Independent Claim
60 words
A METHOD FOR FORMING A SOLID DOPANT SOURCE FOR VAPOR PHASE TRANSPORT OF PHOSPHORUS OXIDE AT ELEVATED TEMPERATURES COMPRISING THE STEPS OF: IMPREGNATING A POROUD, INERT, RIGID, DIMENSIONALLY STABLE. REFRACTORY SUPPORT WITH A SOLUTION WHICH IS IN-SITU THERMALLY REACTABLE TO FORM ALUMINUM METAPHOSPHATE, AND HEATING THE IMPREGNATED SUPPORT AT A TEMPERATURE AND FOR A TIME TO FORM ALUMINUM METAPHOSPHATE IN-SITU.
Claim 6
Independent Claim
60 words
A METHOD FOR FORMING A SOLID DOPANT SOURCE FOR VAPOR PHASE TRANSPORT OF PHOSPHORUS OXIDE AT ELEVATED TEMPERATURES COMPRISING THE STEPS OF: IMPREGNATING A POROUD, INERT, RIGID, DIMENSIONALLY STABLE. REFRACTORY SUPPORT WITH A SOLUTION WHICH IS IN-SITU THERMALLY REACTABLE TO FORM ALUMINUM METAPHOSPHATE, AND HEATING THE IMPREGNATED SUPPORT AT A TEMPERATURE AND FOR A TIME TO FORM ALUMINUM METAPHOSPHATE IN-SITU.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |