Patent US3236989A successfully refreshed from Google Patents.
US3236989A
Expired / Lapsed
US
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Explosion-proof electrical accessory assembly
Assignee: Killark Electric Manufacturing Co
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Filing: 1963-08-09
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Granted: 1966-02-22
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Expires: 1983-08-09
Abstract
No abstract record available.
Inventors
- 👤 Marshall G Zavertnik
- 👤 Richard E Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:41
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/02; H01H9/04; H01H9/042; H01H13/00; H01H13/02; H01H13/023; H01H19/00; H01H19/54; H01H19/60; H01H19/63
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
IN AN ELECTRICAL POLYGONAL BOX ASSEMBLY: A POLYGONAL BOX BASE AND A BOX COVER, THE BASE HAVING BOTTOM, SIDE AND END WALL AND AN OPEN TOP; MEANS PROVIDING A THREADED OPENING THROUGH ONE OF THE WALLS FOR INTRODUCTION OF ELECTRICAL LEADS AND CONNECTION OF A THREADED CONDUIT; POLYGONAL TOP SURFACE ON THE BOX BASE ADAPTED TO RECEIVE AT WILL ONE OF A NUMBER OF THE COVERS THAT HAVE UNDER POLYGONAL SURFACES COMPLEMENTARY TO THE SAID TOP SURFACE, REMOVABLE MEANS TO ATTACH THE COVER TO THE BOX BASE TIGHTLY AND TO DRAW THE COMPLEMENTARY SURFACES OF THE BASE AND COVER TOGETHER, THE SAID COMPLEMENTARY BOX BASE AND COVER SURFACES BEING SMOOTH AND OF SUFFICIENT EXTENT TO INHIBIT FLAME FLOW WHEN THE COVER IS ATTACHED IN PLACE; THE BOX BASE HAVING SUPPORTING AND CONNECTION MEANS TO RECEIVE ANY ONE OF A NUMBER OF DIFFERENT MOUNTING PLATES, ALL OF WHICH HAVE CONNECTING MEANS COMPLEMENTARY TO THOSE ON THE BOX, ONE SUCH PLATE HAVING MEANS TO SUPPORT AT LEAST TWO DIFFERENT ELECTRICAL UNITS; THE SAID ONE SUCH
Claim 2
Dependent Claim
173 words
IN AN ELECTRICAL POLYGONAL BOX ASSEMBLY: A POLYGONAL BOX BASE AND A BOX COVER, THE BASE HAVING BOTTOM, SIDE AND END WALL AND AN OPEN TOP; MEANS PROVIDING A THREADED OPENING THROUGH ONE OF THE WALLS FOR INTRODUCTION OF ELECTRICAL LEADS AND CONNECTION OF A THREADED CONDUIT; POLYGONAL TOP SURFACE ON THE BOX BASE ADAPTED TO RECEIVE AT WILL ONE OF A NUMBER OF THE COVERS THAT HAVE UNDER POLYGONAL SURFACES COMPLEMENTARY TO THE SAID TOP SURFACE, REMOVABLE MEANS TO ATTACH THE COVER TO THE BOX BASE TIGHTLY AND TO DRAW THE COMPLEMENTARY SURFACES OF THE BASE AND COVER TOGETHER, THE SAID COMPLEMENTARY BOX BASE AND COVER SURFACES BEING SMOOTH AND OF SUFFICIENT EXTENT TO INHIBIT FLAME FLOW WHEN THE COVER IS ATTACHED IN PLACE; THE BOX BASE HAVING SUPPORTING AND CONNECTION MEANS TO RECEIVE ANY ONE OF A NUMBER OF DIFFERENT MOUNTING PLATES, ALL OF WHICH HAVE CONNECTING MEANS COMPLEMENTARY TO THOSE ON THE BOX, ONE SUCH PLATE HAVING MEANS TO SUPPORT AT LEAST TWO DIFFERENT ELECTRICAL UNITS; THE SAID ONE SUCH
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |