US3864204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayered safety glass
Assignee: PPG Industries Inc
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Filing: 1969-04-24
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Granted: 1975-02-04
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Expires: 1989-04-24
Abstract
Abstract A multilayered safety glass laminate comprising a plurality of alternate plies of glass and thermoplastic transparent interlayers arranged to provide an impact striking sectiion, a transition section and a novel impact absorption section. The laminate has bullet-resistant capability over a wide range of temperatures including severely cold temperatures. The novel impact absorption section comprises the penultimate and innermost glass plies of the laminate that are relatively thin compared to the other glass plies located in the impact striking section. The relatively thin glass plies of the novel impact absorption section are laminated to the opposite sides of an interlayer whose thickness is intermediate that of a relatively thick interlayer that serves as the impact transition section and that of the interlayers of the impact striking sections.
Inventors
- 👤 Norman Shorr
- 👤 Jr Harry E Littell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:14
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10036; B32B17/10045; B32B17/1055; B32B17/10605; B32B17/10761; F; F41; F41H; F41H5/00; F41H5/02; F41H5/04; F41H5/0407; B32B2250/00; B32B2250/42; B32B2329/00; B32B2329/06; B32B2375/00; Y; Y10; Y10S; Y10S428/00; Y10S428/911; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24983; Y10T428/31504; Y10T428/31551; Y10T428/31598; Y10T428/31601; Y10T428/31627; Y10T428/3163
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
220 words
A MULTIPLATE SAFETY GLASS COMPRISING AN OUTWARD FACING, IMPACT STRIKING SECTION INCLUDING AN OUTER PLY OF RELATIVELY THICK GLASS, A PLURALITY OF INTERMEDIATE PLIES OF RELATIVELY THICK GLASS, AND AN INTERLAYER OF TRANSPARENT THERMOPLASTIC MATERIAL ADHERENT TO GLASS INTERPOSED BETWEEN ADJACENT GLASS PLIES, SAID INTERLAYERS SEPARATING SAID RELATIVELY THICK GLASS PLIES BEING RELATIVELY THIN AND HAVNG A TOTAL THICKNESS LESS THAN THAT OF ANY OF SAID RELATIVELY THICK GLASS PLIES IN THE AREA INTERMEDIATE ADJACENT OF SAID RELATIVELY THICK GLASS PLIES; AN IMPACT TRANSITION SECTION COMPRISING A RELATIVELY THICK SHEET OF TRANSPARENT THERMOPLASTIC INTERLAYER MATERIAL HAVING A THICKNESS GREATER THAN SAID TOTAL THICKNESS IN THE AREA FACING SAID GLASS PLIES; AND AN IMPACT ABSORPTION SECTION COMPRISING A PENULTIMATE, RELATIVELY THIN GLASS PLY, AN INNERMOST, RELATIVELY THIN GLASS PLY AND AN INTERLAYER OF TRANSPARENT, THERMOPLASTIC INTERLAYER MATERIAL SEPARATING SAID PENULTIMATE, RELATIVELY THIN GLASS PLY FROM SAID INNERMOST, RELATIVELY THIN GLASS PLY, SAID INTERLAYER OF SAID IMPACT ABSORPTION SECTION HAVING A THICKNESS IN THE AREA BETWEEN SAID RELATIVELY THIN GLASS PLIES GREATER THAN THOSE OF SAID INTERLAYERS IN SAID IMPACT STRIKING SECTION AND LESS THAN THAT OF SAID IMPACT TRANSITION SECTION, THE TOTAL THICKNESS OF SAID GLASS PLIES IN SAID IMPACT ABSORPTION SECTION BEING LESS THAN THE THICKNESS OF EACH OF SAID PLIES OF RELATIVELY THICK GLASS IN SAID IMPACT STRIKING SECTION.
Claim 2
Dependent Claim
220 words
A MULTIPLATE SAFETY GLASS COMPRISING AN OUTWARD FACING, IMPACT STRIKING SECTION INCLUDING AN OUTER PLY OF RELATIVELY THICK GLASS, A PLURALITY OF INTERMEDIATE PLIES OF RELATIVELY THICK GLASS, AND AN INTERLAYER OF TRANSPARENT THERMOPLASTIC MATERIAL ADHERENT TO GLASS INTERPOSED BETWEEN ADJACENT GLASS PLIES, SAID INTERLAYERS SEPARATING SAID RELATIVELY THICK GLASS PLIES BEING RELATIVELY THIN AND HAVNG A TOTAL THICKNESS LESS THAN THAT OF ANY OF SAID RELATIVELY THICK GLASS PLIES IN THE AREA INTERMEDIATE ADJACENT OF SAID RELATIVELY THICK GLASS PLIES; AN IMPACT TRANSITION SECTION COMPRISING A RELATIVELY THICK SHEET OF TRANSPARENT THERMOPLASTIC INTERLAYER MATERIAL HAVING A THICKNESS GREATER THAN SAID TOTAL THICKNESS IN THE AREA FACING SAID GLASS PLIES; AND AN IMPACT ABSORPTION SECTION COMPRISING A PENULTIMATE, RELATIVELY THIN GLASS PLY, AN INNERMOST, RELATIVELY THIN GLASS PLY AND AN INTERLAYER OF TRANSPARENT, THERMOPLASTIC INTERLAYER MATERIAL SEPARATING SAID PENULTIMATE, RELATIVELY THIN GLASS PLY FROM SAID INNERMOST, RELATIVELY THIN GLASS PLY, SAID INTERLAYER OF SAID IMPACT ABSORPTION SECTION HAVING A THICKNESS IN THE AREA BETWEEN SAID RELATIVELY THIN GLASS PLIES GREATER THAN THOSE OF SAID INTERLAYERS IN SAID IMPACT STRIKING SECTION AND LESS THAN THAT OF SAID IMPACT TRANSITION SECTION, THE TOTAL THICKNESS OF SAID GLASS PLIES IN SAID IMPACT ABSORPTION SECTION BEING LESS THAN THE THICKNESS OF EACH OF SAID PLIES OF RELATIVELY THICK GLASS IN SAID IMPACT STRIKING SECTION.
Claim 3
Dependent Claim
28 words
A multiplate safety glass as in claim 1, wherein said interlayers are composed of a material taken from the class consisting of plasticized polyvinyl acetal and a polyurethane.
Claim 4
Dependent Claim
19 words
A multiplate safety glass as in claim 2, wherein all of said interlayers are composed of plasticized polyvinyl butyral.
Claim 5
Dependent Claim
18 words
A multiplate safety glass as in claim 2, wherein all of said interlayers are composed of a polyurethane.
Claim 6
Dependent Claim
32 words
A multiplate safety glass as in claim 2, wherein at least one of said interlayers is composed of plasticized polyvinyl butyral and the remainder of said interlayers is composed of a polyurethane.
Claim 7
Dependent Claim
22 words
A multiplate safety glass as in claim 1, wherein said innermost, relatively thin glass ply has a maximum thickness of 0.100 inch.
Claim 8
Dependent Claim
44 words
A multiplate safety glass as in claim 6, wherein said interlayer of said impact absorption section has a thickness between about 20 percent and about 60 percent of the thickness of said relatively thick sheet of transparent, thermoplastic material of said impact transition section.
Claim 9
Dependent Claim
44 words
A multiplate safety glass as in claim 1, wherein said interlayer of said impact absorption section has a thickness between about 20 percent and about 60 percent of the thickness of said relatively thick sheet of transparent, thermoplastic material of said impact transition section.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |