Method of forming a resist pattern on a circuit board or the like
Abstract
Abstract A METHOD OF APPLYING A RESIST COATING TO THE SURFACE OF A CIRCUIT BOARD OR THE LIKE HAVING A PLURALITY OF HOLES THERETHROUGH IN WHICH THE BOARD IS ASSEMBLED OVER AN OPENING IN A PRESSURIZED FIXTURE WITH THE PERIPHERY OF THE BOARD IN FLUIDTIGHT RELATIONSHIP WITH THE PERIPHERY OF THE OPENING TO CAUSE THE PRESSURIZING FLUID TO FLOW THROUGH THE HOLES AND OUTWARDLY OF THE EXPOSED SURFACE OF THE BOARD. UNDER THE CONDITIONS, A COATING OF RESIST IS APPLIED TO THE EXPOSED SURFACE IN ANY SUITABLE MANNER KNOWN TO THE ART WITH THE FLUID FLOWING THROUGH THE HOLES PREVENTING THE FLOW OF RESIST INTO THE HOLES AND KEEPING THE HOLES OPEN. AT LOCATIONS AT WHICH THE BOARD HAS RELATIVELY LARGE HOLES, POSTS OR PINS ON THE FIXTURE EXTEND UPWARDLY THROUGH THE CENTRAL PORTIONS OF THE OPENINGS TO THE SURFACE OF THE BOARD, THE SIZE OF THE POSTS BEING SUCH AS TO FILL THE CENTERS OF THE HOLES WHILE LEAVING ANNULAR SPACES THEREAROUND FOR THE FLOW OF FLUID.
Inventors
- 👤 George E Vincent Jr
Bibliographic Details
Claims Analysis
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |