US5348631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for synthesizing lead β-diketonates
Assignee: Sharp Corp
•
Filing: 1993-06-07
•
Granted: 1994-09-20
•
Expires: 2013-06-07
Abstract
Abstract A method and apparatus for the synthesis of β-diketonates such as Pb(fod) 2 and Pb(thd) 2 for use as precursors in metalorganic chemical vapor deposition processes. Lead oxide and a medium of pentane and a protonated ligand (H-fod or H-thd) are combined in a flask and subjected to reaction-promoting ultrasonic waves. The flask is immersed in a water bath to maintain a constant cool temperature, and the flask may include one or more arms for cooling and circulation of the medium during the reaction.
Inventors
- 👤 Seshu B. Desu
- 👤 May Nyman
- 👤 Pradyot A. Agaskar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:37
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/77; B; B01; B01J; B01J19/00; B01J19/08; B01J19/10; C01; C01G; C01G21/00; C01G21/02; C01G21/06; C07C49/00; C07C49/92; C01P; C01P2002/00; C01P2002/80; C01P2002/82; C01P2002/86; C01P2002/88; C01P2002/89; C01P2006/00; C01P2006/32; C01P2006/33; C01P2006/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
29 words
A method of producing a lead β-diketonate, comprising: combining lead oxide with a medium; subjecting the combined lead oxide and medium to ultrasonic waves, and recovering said lead β-diketonate.
Claim 2
Independent Claim
29 words
A method of producing a lead β-diketonate, comprising: combining lead oxide with a medium; subjecting the combined lead oxide and medium to ultrasonic waves, and recovering said lead β-diketonate.
Claim 3
Dependent Claim
20 words
The method of claim 1, further comprising: heating the medium in a vacuum to vaporize non-β-diketonate compounds in the medium.
Claim 4
Dependent Claim
39 words
The method of claim 1, wherein the lead oxide and medium are combined in a flask, and the step of subjecting the combined lead oxide and medium to ultrasonic waves is by placing an ultrasonic probe into the flask.
Claim 5
Dependent Claim
67 words
The method of claim 3, wherein the flask has a lower portion and an upper portion above the lower portion, and at least one conduit having one end in communication with the lower portion and another end in communication with the upper portion, and further comprising circulating the combined lead oxide and medium through the conduit while subjecting the combined lead oxide and medium to ultrasonic waves.
Claim 6
Dependent Claim
44 words
The method of claim 4, wherein the flask is immersed in a water bath, and further comprising cooling the conduit and thereby cooling the combined lead oxide and medium with the water bath while subjecting the combined lead oxide and medium to ultrasonic waves.
Claim 7
Dependent Claim
33 words
The method of claim 5, wherein the water bath is contained in a container, and further comprising flowing water through the container while subjecting the combined lead oxide and medium to ultrasonic waves.
Claim 8
Dependent Claim
37 words
The method of claim 4, wherein the circulation of the combined lead oxide and medium through the conduit is from the end in communication with the lower portion to the end in communication with the upper portion.
Claim 9
Dependent Claim
16 words
The method of claim 1, wherein the β-diketonate includes Pb(fod) 2 and the medium includes H-fod.
Claim 10
Dependent Claim
16 words
the method of claim 1, wherein the β-diketonate includes Pb(thd) 2 and the medium includes H-thd.
Claim 11
Dependent Claim
10 words
The method of claim 1, wherein the medium includes pentane.
References Cited (Backward Citations)
US3245892A
Cited
US3351539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |