Patent US2410268A successfully refreshed from Google Patents.
US2993815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallizing refractory substrates
Assignee: AT&T Inc
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Filing: 1959-05-25
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Granted: 1961-07-25
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Expires: 1979-05-25
Abstract
No abstract record available.
Inventors
- 👤 Arnold W Treptow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:16
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/5127; C04B41/5183; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H; H01; H01B; H01B1/00; H01B1/14; H01B1/16; H05; H05K; H05K3/00; H05K3/10; H05K3/105; H05K2203/00; H05K2203/11; H05K2203/1105; H05K2203/12; H05K2203/125; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
THE METHOD OF FORMING A CONDUCTIVE COPPER LAYER ON A REFRACTORY SUBSTRATE WHICH COMPRISES APPLYING TO SAID REFRACTORY SUBSTRATE A MIXTURE OF FROM 5 TO 50 PARTS BY WEIGHT OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF COPPER AND COPPER OXIDE, AND ONE PART BY WEIGHT OF A REDUCTION-RESISTANT GLASS FLUX, SAID MIXTURE BEING SUSPENDED IN A VOLATILE AND DECOMPOSABLE FLUID SUSPENDING MEDIUM, FIRING SAID SUBSTRATE IN AN OXIDIZING ATMOSPHERE UNTIL SAID GLASS FLUX IS PARTIALLY SINTERED AND WETS SAID REFRACTORY SUBSTRATE AND SAID SUSPENDING MEDIUM IS VOLATILIZED LEAVING SUBSTANTIALLY NO RESIDUE, AND THEN FIRING SAID SUBSTRATE IN A CONTROLLED ATMOSPHERE OF 55 TO 89 PERCENT BY VOLUME OF NITROGEN, 8 TO 44 PERCENT BY VOLUME OF HYDROGEN AND 0.4 TO 6 PERCENT BY VOLUME OF OXYGEN UNTIL THE SINTERING OF SAID GLASS FLUX IS COMPLETED.
Claim 2
Independent Claim
137 words
THE METHOD OF FORMING A CONDUCTIVE COPPER LAYER ON A REFRACTORY SUBSTRATE WHICH COMPRISES APPLYING TO SAID REFRACTORY SUBSTRATE A MIXTURE OF FROM 5 TO 50 PARTS BY WEIGHT OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF COPPER AND COPPER OXIDE, AND ONE PART BY WEIGHT OF A REDUCTION-RESISTANT GLASS FLUX, SAID MIXTURE BEING SUSPENDED IN A VOLATILE AND DECOMPOSABLE FLUID SUSPENDING MEDIUM, FIRING SAID SUBSTRATE IN AN OXIDIZING ATMOSPHERE UNTIL SAID GLASS FLUX IS PARTIALLY SINTERED AND WETS SAID REFRACTORY SUBSTRATE AND SAID SUSPENDING MEDIUM IS VOLATILIZED LEAVING SUBSTANTIALLY NO RESIDUE, AND THEN FIRING SAID SUBSTRATE IN A CONTROLLED ATMOSPHERE OF 55 TO 89 PERCENT BY VOLUME OF NITROGEN, 8 TO 44 PERCENT BY VOLUME OF HYDROGEN AND 0.4 TO 6 PERCENT BY VOLUME OF OXYGEN UNTIL THE SINTERING OF SAID GLASS FLUX IS COMPLETED.
References Cited (Backward Citations)
US2407251A
Cited
US2886476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |