US3169063A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making printed circuits
Assignee: Unisys Corp
•
Filing: 1961-06-29
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Granted: 1965-02-09
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Expires: 1981-06-29
Abstract
No abstract record available.
Inventors
- 👤 Robert L Johnston
- 👤 Wilbur E Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:50
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0002; H05K3/40; H05K3/42; H05K3/425; H05K3/427; H05K2203/00; H05K2203/05; H05K2203/0548; H05K2203/056; H05K2203/15; H05K2203/1572; H05K3/02; H05K3/06; H05K3/061; H05K3/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF OBTAINING REGISTRATION BETWEEN CIRCUITRY ON BOTH SIDES OF A PRINTED CIRCUIT BOARD COMPRISING THE STEPS OF: SEPARATELY APPLYING OPAQUE PADS AND REMOVABLE CIRCUIT LINES FOR SIDE ONE OF THE PRINTED CIRCUIT BOARD ON A TRANSPARENT GRID MASTER, PHOTO-PROJECTION PRINTING SAID GRID MATTER OF SIDE ONE, DEVELOPING A NEGATIVE OF SIDE ONE, REMOVING THE CIRCUIT LINES ONLY FOR SIDE ONE, APPLYING NEW CIRCUIT LINES FOR SIDE TWO UTILIZING THE SAME PAD LOCATIONS, PHOTO-PROJECTION PRINTING SAID GRID MASTER OF SIDE TWO, DEVELOPING A NEGATIVE OF SIDE TWO, REGISTERING THE NEGATIVES OF SIDES ONE AND TWO AND PUNCHING REGISTRATION HOLES THROUGH THEM, FORMING IDENTICALLY-SPACED REGISTRA-
Claim 2
Independent Claim
105 words
A METHOD OF OBTAINING REGISTRATION BETWEEN CIRCUITRY ON BOTH SIDES OF A PRINTED CIRCUIT BOARD COMPRISING THE STEPS OF: SEPARATELY APPLYING OPAQUE PADS AND REMOVABLE CIRCUIT LINES FOR SIDE ONE OF THE PRINTED CIRCUIT BOARD ON A TRANSPARENT GRID MASTER, PHOTO-PROJECTION PRINTING SAID GRID MATTER OF SIDE ONE, DEVELOPING A NEGATIVE OF SIDE ONE, REMOVING THE CIRCUIT LINES ONLY FOR SIDE ONE, APPLYING NEW CIRCUIT LINES FOR SIDE TWO UTILIZING THE SAME PAD LOCATIONS, PHOTO-PROJECTION PRINTING SAID GRID MASTER OF SIDE TWO, DEVELOPING A NEGATIVE OF SIDE TWO, REGISTERING THE NEGATIVES OF SIDES ONE AND TWO AND PUNCHING REGISTRATION HOLES THROUGH THEM, FORMING IDENTICALLY-SPACED REGISTRA-
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-09 | 1968-08-10 | 1969-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-09 | 1972-08-10 | 1973-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-09 | 1976-08-10 | 1977-02-09 | $7700.00 | Window Closed / Lapsed |