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Abstract
Abstract STORED IN A DESIGN AUTOMATION (DA) SYSTEM IS A LIBRARY OF PREDESIGNED GRAPHICAL DESCRIPTIONS THAT DESCRIBE CIRCUITS DESINGED BY THE FREE FROM TECHNIQUE. A CHIP DESIGNER WOULD LAYOUT A CHIP INCLUDING BOTH FREE END AND RULES DRIVEN PORTIONS. AN INPUT IS FED TO THE DA SYSTEM WHICH SPECIFIES THE RULES DRIVEN DESIGN IN THE ESTABLISHED MANNER AND SPECIFIES THE FREE FORM FROM DESIGN BY DEFINING THE LIBRARY DESCRIPTION THEREOF. AND THE RELATIVE PLACEMENT OF THE DESIGN ON THE CHIP. THE SYSTEM IN RESPONSE TO SUCH INPUT GENERATES A GRAPHICAL DESCRIPTION OF THE RULES DRIVEN DESIGN WITHOUT DOING ANY AUTOMATIC CHECKING OF THE INTERNALS OF THE FREE FROM DESIGN. THE GENERATED DESCRIPTION TO TOPOLOGY IS THEN MERGED WITH THE FREE FROM DESCRIPTION OR TOPOLOGY FROM THE LIBARY TO FORM A COMPLETE CHIP DESCRIPTION FROM WHICH IS DERIVED DATA FOR MAKING THE MASKS.
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |