Patent US3137072A successfully refreshed from Google Patents.
US3137072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drafting board with magnetic t-square
Assignee: Individual
•
Filing: 1961-07-26
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Granted: 1964-06-16
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Expires: 1981-07-26
Abstract
No abstract record available.
Inventors
- 👤 William B Terry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:49
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/02; B43L13/04; B43L13/048; Y; Y10; Y10S; Y10S33/00; Y10S33/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A T-SQUARE COMPRISING A CONVENTIONAL HEAD AND LEG, SAID LEG BEING DISPOSED AT RIGHT ANGLES TO THE LENGTHWISE DIMENSION OF THE HEAD AND SECURED AT ONE END ATOP A MEDIAN PORTION OF SAID HEAD, TOP AND BOTTOM PLATES PARALLEL TO EACH OTHER AND ATTACHED TO AND FACING TOP AND BOTTOM SURFACES OF SAID HEAD, AT LEAST ONE SPOOL PROVIDING A ROLLER, SAID SPOOL BEING LOCATED IN A RECESS BETWEEN SAID PLATES AND BEING CONNECTED TO SAID PLATES FOR FREE ROTATION BY AN ATTACHING AND RETAINING PIVOT PIN, A SEGMENTAL EDGE PORTION OF SAID SPOOL PROJECTING BEYOND COOPERATING GUIDE EDGE PORTIONS OF SAID PLATES, AND A HORSESHOE-TYPE MAGNET LOCATED IN SAID RECESS, COOPERABLE WITH SAID SPOOL, AND HAVING LEG PORTIONS THEREOF EMBRACING THE HUB PORTION OF THE SPOOL BETWEEN THE END HEADS OF SAID SPOOL.
Claim 2
Dependent Claim
134 words
A T-SQUARE COMPRISING A CONVENTIONAL HEAD AND LEG, SAID LEG BEING DISPOSED AT RIGHT ANGLES TO THE LENGTHWISE DIMENSION OF THE HEAD AND SECURED AT ONE END ATOP A MEDIAN PORTION OF SAID HEAD, TOP AND BOTTOM PLATES PARALLEL TO EACH OTHER AND ATTACHED TO AND FACING TOP AND BOTTOM SURFACES OF SAID HEAD, AT LEAST ONE SPOOL PROVIDING A ROLLER, SAID SPOOL BEING LOCATED IN A RECESS BETWEEN SAID PLATES AND BEING CONNECTED TO SAID PLATES FOR FREE ROTATION BY AN ATTACHING AND RETAINING PIVOT PIN, A SEGMENTAL EDGE PORTION OF SAID SPOOL PROJECTING BEYOND COOPERATING GUIDE EDGE PORTIONS OF SAID PLATES, AND A HORSESHOE-TYPE MAGNET LOCATED IN SAID RECESS, COOPERABLE WITH SAID SPOOL, AND HAVING LEG PORTIONS THEREOF EMBRACING THE HUB PORTION OF THE SPOOL BETWEEN THE END HEADS OF SAID SPOOL.
References Cited (Backward Citations)
GB191223008A
Cited
GB768399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |