US3698646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite carbon insert for gas shielded welding torch nozzle
Assignee: Pfizer Inc
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Filing: 1971-01-08
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Granted: 1972-10-17
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Expires: 1991-01-08
Abstract
Abstract A carbon composite insert is mounted within the removable gasconducting nozzle of a gas-shielded welding torch to prolong nozzle life and to render the inner surface thereof less adherent to weld splatter, thereby facilitating cleaning. The insert consists of a tubular base having a coating of pyrolytic carbon. The resulting composite insert exhibits enhanced physical strength and spalling resistance.
Inventors
- 👤 William A Robba
- 👤 Earl E Conabee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; B; B23; B23K; B23K9/00; B23K9/24; B23K9/28; B23K9/29; B23K9/291; C04B35/515; C04B35/52; C04B35/522
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
An nozzle as set forth in claim 1 wherein said base consists essentially of polycrystalline graphite.
Claim 2
Dependent Claim
21 words
An nozzle as set forth in claim 2 wherein said coating has a thickness of from about 0.0005 to 0.01 inch.
Claim 3
Dependent Claim
24 words
An nozzle as set forth in claim 1 wherein said base consists essentially of carbonized felt and said coating is impregnated on said felt.
Claim 4
Dependent Claim
20 words
An nozzle as set forth in claim 4 having an additional coating of anisotropic pyrolytic graphite on the surface thereof.
Claim 5
Dependent Claim
24 words
An nozzle as set forth in claim 5 wherein said anisotropic pyrolytic graphite coating hAs a thickness of from about 0.0005 to 0.01 inch.
Claim 6
Dependent Claim
32 words
A composite nozzle for a gas-shielded welding torch comprising the nozzle set forth in claim 1, and a supporting tube of heat resistant material, said nozzle being mounted within said supporting tube.
Claim 7
Dependent Claim
28 words
A composite nozzle as set forth in claim 7 wherein said supporting tube has a counterbore within the exit end and said nozzle is mounted within said counterbore.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |