Patent US3449721A successfully refreshed from Google Patents.
US3449721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphical display system
Assignee: Massachusetts Institute of Technology
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Filing: 1966-10-31
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Granted: 1969-06-10
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Expires: 1986-10-31
Abstract
No abstract record available.
Inventors
- 👤 Michael L Dertouzos
- 👤 Huber L Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:36
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/08; G09G1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A SYSTEM FOR DISPLAYING A CONTOUR COMPOSED OF A PLURALITY OF CURVE PORTIONS COMPRISING: MEANS FOR STORING INFORMATION SPECIFYING SEQUENTIALLY THE INITIAL AND FINAL POSITIONS OF EACH OF SAID CURVE PORTIONS, THE CURVATURE OF EACH OF SAID CURVE PORTIONS BETWEEN SAID INITIAL AND FINAL POSITIONS AND THE SLOPES OF EACH OF SAID CURVE PORTIONS AT SAID INITIAL AND FINAL POSITIONS; NETWORK MEANS HAVING A PLURALITY OF VARIABLE PARAMETERS RESPONSIVE TO SAID POSITION, CURVATURE, AND SLOPE INFORMATION FOR PRODUCING A PLURALITY OF OUTPUT SIGNALS REPRESENTATIVE OF EACH OF SAID CURVE PORTIONS; AND MEANS RESPONSIVE TO SAID OUTPUT SIGNALS FOR SEQUENTIALLY DISPLAYING SAID CURVE PORTIONS THEREBY DISPLAYING A REPRODUCTION OF SAID CONTOUR.
Claim 2
Independent Claim
110 words
A SYSTEM FOR DISPLAYING A CONTOUR COMPOSED OF A PLURALITY OF CURVE PORTIONS COMPRISING: MEANS FOR STORING INFORMATION SPECIFYING SEQUENTIALLY THE INITIAL AND FINAL POSITIONS OF EACH OF SAID CURVE PORTIONS, THE CURVATURE OF EACH OF SAID CURVE PORTIONS BETWEEN SAID INITIAL AND FINAL POSITIONS AND THE SLOPES OF EACH OF SAID CURVE PORTIONS AT SAID INITIAL AND FINAL POSITIONS; NETWORK MEANS HAVING A PLURALITY OF VARIABLE PARAMETERS RESPONSIVE TO SAID POSITION, CURVATURE, AND SLOPE INFORMATION FOR PRODUCING A PLURALITY OF OUTPUT SIGNALS REPRESENTATIVE OF EACH OF SAID CURVE PORTIONS; AND MEANS RESPONSIVE TO SAID OUTPUT SIGNALS FOR SEQUENTIALLY DISPLAYING SAID CURVE PORTIONS THEREBY DISPLAYING A REPRODUCTION OF SAID CONTOUR.
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) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |