Patent US4309265A successfully refreshed from Google Patents.
US4309265A
Expired / Lapsed
US
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Cathode mask knob
Assignee: RCA Corp
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Filing: 1981-01-15
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Granted: 1982-01-05
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Expires: 2001-01-15
Abstract
Abstract A cathode mask knob is disclosed which has a metal insert for holding a matrix in mechanical and electrical contact with the end of the cathode of an electroforming apparatus. The knob further has a resiliant seal around the insert and an outer shield of a dielectric material.
Inventors
- 👤 John J. Prusak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:22
CPC Classifications
C; C25; C25D; C25D17/00; C25D17/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
169 words
The device for holding the center portion of a record matrix in liquid-tight electrical contact with a threaded end of a cathode of an electroforming apparatus; said device being an integral member comprised of a metal insert, a dielectric shield and a resilient seal; said metal insert having an exposed threaded end portion shaped to threadably engage and mate with the threaded end of the cathode; said metal insert being mounted in said dielectric shield with said shield electrically insulating all the surfaces of the metal insert with the exception of the exposed end portion and said resilient seal being positioned in said shield adjacent to and surrounding the metal insert whereby when a matrix is placed on the surface of said cathode and said device is threaded with and tightened onto said cathode, the metal insert forces the matrix into electrical contact with the cathode; the seal member compresses to form a liquid-tight seal about the metal insert and the dielectric shield prevents plating of the metal insert.
Claim 2
Independent Claim
169 words
The device for holding the center portion of a record matrix in liquid-tight electrical contact with a threaded end of a cathode of an electroforming apparatus; said device being an integral member comprised of a metal insert, a dielectric shield and a resilient seal; said metal insert having an exposed threaded end portion shaped to threadably engage and mate with the threaded end of the cathode; said metal insert being mounted in said dielectric shield with said shield electrically insulating all the surfaces of the metal insert with the exception of the exposed end portion and said resilient seal being positioned in said shield adjacent to and surrounding the metal insert whereby when a matrix is placed on the surface of said cathode and said device is threaded with and tightened onto said cathode, the metal insert forces the matrix into electrical contact with the cathode; the seal member compresses to form a liquid-tight seal about the metal insert and the dielectric shield prevents plating of the metal insert.
Claim 3
Dependent Claim
16 words
The device according to claim 1 wherein the metal insert has a female threaded end portion.
Claim 4
Dependent Claim
19 words
The device according to claim 1 wherein the metal insert is made of the same metal as the cathode.
Claim 5
Dependent Claim
16 words
The device according to claim 1 wherein the outer surface of the dielectric shield is knurled.
Claim 6
Dependent Claim
23 words
The device according to claim 1 wherein the outer surface of the dielectric shield is shaped to be mechanically engaged with a wrench.
Claim 7
Dependent Claim
21 words
The device according to claim 5 wherein a portion of the outer surface of the shield is hexagonal in cross section.
Claim 8
Dependent Claim
18 words
The device according to claim 1 includes a cord means for securing said device to the electroforming apparatus.
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) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |