US3756895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vented roof systems employing microporous membranes
Assignee: SB Decking Inc
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Filing: 1970-07-23
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Granted: 1973-09-04
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Expires: 1990-07-23
Abstract
Abstract TRAFFIC BEARING AND NONTRAFFIC BEARING ROOF SYSTEMS COMPRISING A SUBSTANTIALLY VAPOR IMPERMEABLE STRUCTURAL SUBSTRATE AND A WATERPROOF, SUBSTANTIALLY VAPOR IMPERMEABLE PROTECTIVE TOP LAYER VENTED WITH A MICROPOROUS MEMBRANE TO RELIEVE VAPOR PRESSURE FROM WITHIN THE SYSTEM THEREBY PREVENTING BLISTERING, CRACKING AND EVENTUAL DESTRUCTION OF THE WEATHERPROOF PROTECTIVE TOP LAYER.
Inventors
- 👤 R Bellamy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:48
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/17; E04D5/00; E04D5/12; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1064; Y10T156/1082; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/24998
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |