Patent US3345246A successfully refreshed from Google Patents.
US3345246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leveling base sheet for reroofing
Assignee: Dow Chemical Co
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Filing: 1964-07-13
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Granted: 1967-10-03
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Expires: 1984-07-13
Abstract
No abstract record available.
Inventors
- 👤 James P Sheahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:50
CPC Classifications
E; E04; E04D; E04D11/00; E04D11/02; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249977; Y10T428/249982; Y10T428/249985; Y10T428/249987; Y10T428/26; Y10T442/00; Y10T442/50; Y10T442/59
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
AN IMPROVED REROOFED STRUCTURE COMPRISING A ROOF OF UNSERVICEABLE NATURE HAVING AN IRREGULAR SURFACE, A LAYER OF EXPANDED CELLULAR THERMOPLASTIC RESINOUS POLYMER OF STYRENE AND ACRYLONITRILE HAVING A THICKNESS OF ABOUT 1/4 TO 1 INCH HAVING A HEAT DISTORTION TEMPERATURE OF AT LEAST ABOUT 185* FAHRENHEIT, A COMPRESSIVE STRENGTH OF FROM ABOUT 5 TO ABOUT 15 POUNDS PER SQUARE INCH AND A FLEXURAL STRENGTH OF FROM ABOUT 15 TO ABOUT 35 PONDS PER SQUARE
Claim 2
Dependent Claim
74 words
AN IMPROVED REROOFED STRUCTURE COMPRISING A ROOF OF UNSERVICEABLE NATURE HAVING AN IRREGULAR SURFACE, A LAYER OF EXPANDED CELLULAR THERMOPLASTIC RESINOUS POLYMER OF STYRENE AND ACRYLONITRILE HAVING A THICKNESS OF ABOUT 1/4 TO 1 INCH HAVING A HEAT DISTORTION TEMPERATURE OF AT LEAST ABOUT 185* FAHRENHEIT, A COMPRESSIVE STRENGTH OF FROM ABOUT 5 TO ABOUT 15 POUNDS PER SQUARE INCH AND A FLEXURAL STRENGTH OF FROM ABOUT 15 TO ABOUT 35 PONDS PER SQUARE
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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |