Patent US3220323A successfully refreshed from Google Patents.
US3220323A
Expired / Lapsed
US
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Pavement finishing apparatus
Assignee: Individual
•
Filing: 1962-04-02
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Granted: 1965-11-30
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Expires: 1982-04-02
Abstract
No abstract record available.
Inventors
- 👤 Lewis William Hurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:47
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/22; E01C19/30; E01C19/34; E01C19/40; E01C19/407
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PAVEMENT FINISHER COMPRISING: A FRAME; MEANS FOR PROPELLING SAID FRAME OVER A SURFACE TO BE PAVED; A PAIR OF SLIP-FORMS MOUNTED ON SAID FRAME FOR DEFINING THE MARGINS OF SAID PAVEMENT, EACH OF SAID SLIPFORMS BEING DEFINED BY A PLURALITY OF CONTIGUOUSLY ARRANGED SLIP-FORM ELEMENTS, SAID SLIP-FORM ELEMENTS BEING LOOSELY CONNECTED SO AS TO PERMIT RELATIVE MOVEMENT THEREBETWEEN IN A VERTICAL PLANE; AND MOUNTING MEANS INTERPOSED BETWEEN SAID FRAME AND SAID SLIP-FORMS, SAID MOUNTING MEANS INCLUDING VERTICALLY-ACTING RESILIENT MEANS THAT CONSTANTLY BIAS SAID SLIP-FORMS DOWNWARDLY AGAINST THE GROUND SURFACE, WITH THE LOOSE INTERCONNECTION OF SAID SLIPFORM ELEMENTS ENABLING THE LATTER TO GENERALLY CONFORM TO CHANGES IN CONTOUR OF SAID GROUND SURFACE.
Claim 2
Dependent Claim
112 words
A PAVEMENT FINISHER COMPRISING: A FRAME; MEANS FOR PROPELLING SAID FRAME OVER A SURFACE TO BE PAVED; A PAIR OF SLIP-FORMS MOUNTED ON SAID FRAME FOR DEFINING THE MARGINS OF SAID PAVEMENT, EACH OF SAID SLIPFORMS BEING DEFINED BY A PLURALITY OF CONTIGUOUSLY ARRANGED SLIP-FORM ELEMENTS, SAID SLIP-FORM ELEMENTS BEING LOOSELY CONNECTED SO AS TO PERMIT RELATIVE MOVEMENT THEREBETWEEN IN A VERTICAL PLANE; AND MOUNTING MEANS INTERPOSED BETWEEN SAID FRAME AND SAID SLIP-FORMS, SAID MOUNTING MEANS INCLUDING VERTICALLY-ACTING RESILIENT MEANS THAT CONSTANTLY BIAS SAID SLIP-FORMS DOWNWARDLY AGAINST THE GROUND SURFACE, WITH THE LOOSE INTERCONNECTION OF SAID SLIPFORM ELEMENTS ENABLING THE LATTER TO GENERALLY CONFORM TO CHANGES IN CONTOUR OF SAID GROUND SURFACE.
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |