US3663270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brazing stop-off treatment of perforated metal sheets
Assignee: Rohr Inc
•
Filing: 1970-04-20
•
Granted: 1972-05-16
•
Expires: 1990-04-20
Abstract
Abstract A thin, perforated, metal sheet, one side of which is to be brazed to another element, has the other side thereof treated to prevent braze alloy from flowing into and through the perforations by spraying said other side of the sheet with a nonrunny or thixotropic braze stop-off compound while at the same time maintaining a gentle flow of air or other gas through the perforations in the sheet in the direction of spray flow so as to carry away particles of spray material which pass through the perforations and thereby prevent such spray particles from contaminating the brazing side of the sheet.
Inventors
- 👤 Winford Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:01
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/0008; B23K1/0014; Y; Y10; Y10S; Y10S118/00; Y10S118/07
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
32 words
The method of treating a perforated metal sheet preparatory to brazing as defined in claim 1 wherein the spray coating is applied by directing an airless type spray gun at such sheet.
Claim 2
Dependent Claim
60 words
The method of treating a perforated metal sheet preparatory to brazing as defined in claim 1 wherein a perforated sheet to be treated is attached in substantially air-tight relation to shielding means extending marginally beyond the sheet thereby to prevent air or gas borne spray particles from passing around the edges of the sheet and reaching the brazing side thereof.
Claim 3
Dependent Claim
80 words
The method of treating a perforated metal sheet preparatory to brazing as defined in claim 1 wherein the selected perforated area of the sheet is positioned in register with an opening in shielding member shaped to conform to the marginal portion of such perforated sheet laterally beyond such selected perforat area thereof, and applying sealing means to the marginal portion of such perforated sheet, thereby sealing the marginal portion of the sheet in air tight relation to the shielding member.
Claim 4
Dependent Claim
89 words
The method of treating a perforated metal sheet preparatory to brazing as defined in claim 1 wherein the selected, perforated area of the sheet is positioned in register with an opening provided therefor in a wall of a suction cabinet, and the edges of such sheet are sealed in air tight relation to the cabinet, the pressure within the cabinet being reduced relative to the ambient atmospheric pressure sufficiently to provide the required gentle, substantially uniform flow of air or gas through the perforations in the sheet during spraying.
References Cited (Backward Citations)
US2962384A
Cited
US3294576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |