US3264105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of using a master art drawing to produce a two-sided printed circuit board
Assignee: AT&T Inc
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Filing: 1962-05-31
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Granted: 1966-08-02
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Expires: 1982-05-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Fred W Houtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/095; G03F7/0957; H; H05; H05K; H05K3/00; H05K3/0002; H05K2203/00; H05K2203/05; H05K2203/0548; H05K2203/056; H05K2203/15; H05K2203/1572
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
155 words
A METHOD FOR PHOTOGRAPHICALLY REPRODUCING CIRCUIT PATTERNS ON A TWO-SIDED PRINTED CIRCUIT BOARD WHEREIN THE CIRCUITS ON BOTH SIDES ARE ACCURATELY ALIGNED WITH RESPECT TO EACH OTHER, COMPRISING THE FOLLOWING STEPS: APPLYING A FIRST TRANSLUCENT PATTERN OF A FIRST COLOR ONTO A TRANSLUCENT MASTER IN ACCORDANCE WITH A COMMON CIRCUIT PATTERN DESIRED TO BE PRODUCED ON BOTH SIDES OF THE PRINTED CIRCUIT BOARD; APPLYING A SECOND TRANSLUCENT PATTERN OF A SECOND COLOR ONTO THE MASTER IN ACCORDANCE WITH A CIRCUIT PATTERN DESIRED TO BE PRODUCED ONLY ON A FIRST SIDE OF THE PRINTED CIRCUIT BOARD; APPLYING A THIRD TRANSLUCENT PATTERN OF A THIRD COLOR ONTO THE MASTER IN ACCORDANCE WITH A CIRCUIT PATTERN DESIRED TO BE PRODUCED ONLY ON THE SECOND SIDE OF THE PRINTED CIRCUIT BOARD; EXPOSING A FIRST PHOTOSENSITIVE PHOTOGRAPHIC FILM TO LIGHT PASSING THROUGH THE MASTER, THE PATTERNS, AND A FIRST COLOR FILTER WHICH PRECLUDES LIGHT OF THE FIRST AND THIRD COLORS;
Claim 2
Independent Claim
155 words
A METHOD FOR PHOTOGRAPHICALLY REPRODUCING CIRCUIT PATTERNS ON A TWO-SIDED PRINTED CIRCUIT BOARD WHEREIN THE CIRCUITS ON BOTH SIDES ARE ACCURATELY ALIGNED WITH RESPECT TO EACH OTHER, COMPRISING THE FOLLOWING STEPS: APPLYING A FIRST TRANSLUCENT PATTERN OF A FIRST COLOR ONTO A TRANSLUCENT MASTER IN ACCORDANCE WITH A COMMON CIRCUIT PATTERN DESIRED TO BE PRODUCED ON BOTH SIDES OF THE PRINTED CIRCUIT BOARD; APPLYING A SECOND TRANSLUCENT PATTERN OF A SECOND COLOR ONTO THE MASTER IN ACCORDANCE WITH A CIRCUIT PATTERN DESIRED TO BE PRODUCED ONLY ON A FIRST SIDE OF THE PRINTED CIRCUIT BOARD; APPLYING A THIRD TRANSLUCENT PATTERN OF A THIRD COLOR ONTO THE MASTER IN ACCORDANCE WITH A CIRCUIT PATTERN DESIRED TO BE PRODUCED ONLY ON THE SECOND SIDE OF THE PRINTED CIRCUIT BOARD; EXPOSING A FIRST PHOTOSENSITIVE PHOTOGRAPHIC FILM TO LIGHT PASSING THROUGH THE MASTER, THE PATTERNS, AND A FIRST COLOR FILTER WHICH PRECLUDES LIGHT OF THE FIRST AND THIRD COLORS;
Claim 3
Dependent Claim
78 words
THE METHOD AS DEFINED IN CLAIM 1 WHICH INCLUDES THE FOLLOWING STEP: PHOTOGRAPHICALLY REPRODUCING THE FIRST NEGATIVE TO PRODUCE A REVERSE NEGATIVE DEPICTING THE TOTAL CIRCUIT PATTERN IN A DEVELOPED EMULSION WHICH IS ON THE OPPOSITE SIDE OF THE REVERSE NEGATIVE WITH RESPECT TO THE EMULSION SIDE ON THE FIRST NEGATIVE; AND IN WHICH THE SECOND AND THE REVERSE NEGATIVES ARE PLACED IN ALIGNMENT ON OPPOSITE SIDES OF THE BOARD PRIOR TO EXPOSING, DEVELOPING, AND ETHCING THE BOARD.
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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |