US3707432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced fibrous felts for roofing shingle manufacture
Assignee: Johns Manville Corp
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Filing: 1971-05-07
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Granted: 1972-12-26
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Expires: 1991-05-07
Abstract
Abstract A GLASS FIBER FELT IS REINFORCED WITH LONGITUDINALLY EXTENDING GLASS FIBER STRANDS APPLIED IN PARALLEL FROM ABOUT 1/8 TO ABOUT 1 INCH APART SO AS TO PROVIDE INCREASED TENSILE STRENGTH EVENLY DISTRIBUTED THROUGHOUT THE FELT. EACH SHINGLE''S LENGTH IS CUT FROM THE FELT TRANSVERSELY OF THE DIRECTION OF FELT TRAVEL SO THAT THE REINFORCING STRANDS EXTEND FROM THE HEAD PORTION INTO THE BUTT PORTION OF THE SHINGLE. THE STRAND ARRANGEMENT PERMITS FASTER SATURATION AND COATING OF THINNER FELTS AND INCREASES THE TEAR RESISTANCE OF THE SHINGLES.
Inventors
- 👤 Raymond Le Rae Corbin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:08
CPC Classifications
E; E04; E04D; E04D5/00; E04D5/02; D; D21; D21C; D21C3/00; D21C3/003; D21C9/00; D21C9/10; D21C9/16; D21C9/163; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1084; Y10T156/1085; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24413; Y10T428/24421; Y10T428/249921; Y10T428/249924; Y10T428/249933; Y10T442/00; Y10T442/50; Y10T442/59
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |