Granted Patent B2

US 12,446,637 · App. 18/338,215 · Granted Oct 21, 2025

Inventors: Stephen S. Wilson (Las Vegas, NV); Bart E. Wilson (Las Vegas, NV)

Assignee: LAMINATED FILM LLC

A41D13/1184G02B1/041G02B1/14G02B5/208

Abstract

Claims (23)

1. A protective lens stack comprising:

a base layer including a polyethylene terephthalate (PET) film having a thickness of 7 to 8 mil and containing a UV blocking additive; and

one or more removable lens layers stacked on top of the base layer, each of the removable lens layers including a PET film having a thickness of 1 to 4 mil and a first adhesive disposed on a bottom surface of the PET film,

wherein refractive indices of the base layer and the one or more removable lens layers are matched to within 0.2, and a 320 nm transmission of the protective lens stack is less than 5%.

2. The protective lens stack of claim 1 , wherein transmission of the protective lens stack at wavelengths of 320-380 nm is less than 5%.

3. The protective lens stack of claim 1 , wherein the UV blocking additive comprises a hindered amine light stabilizer (HALS).

4. The protective lens stack of claim 1 , wherein the UV blocking additive comprises a UV absorber.

5. The protective lens stack of claim 4 , wherein the UV absorber is selected from the group consisting of carbon black, rutile titanium oxide, hydroxy benzophenone, and benzophenone.

6. The protective lens stack of claim 1 , wherein the UV blocking additive comprises a quencher.

7. The protective lens stack of claim 1 , wherein the thickness of the PET film of the base layer is 7.5 mil.

8. The protective lens stack of claim 1 , wherein the thickness of the PET film of each of the one or more removable lens layers is 2 mil.

9. The protective lens stack of claim 1 , wherein the base layer further includes a second adhesive disposed on a bottom surface of the PET film containing the UV blocking additive, the second adhesive having a pull strength greater than that of the first adhesive.

10. The protective lens stack of claim 1 , wherein a total haze of the protective lens stack is 2% or less.

11. The protective lens stack of claim 10 , wherein the total haze of the protective lens stack is 1%.

12. A single-use face shield to be worn by operating personnel in a medical operating room comprising:

a base layer including a polyethylene terephthalate (PET) film having a thickness of 7 to 8 mil and containing a UV blocking additive to protect the operating personnel's face and eyes from lighting in the medical operating room; and

one or more removable lens layers stacked on top of the base layer, each of the removable lens layers including a PET film having a thickness of 1 to 4 mil and an adhesive disposed on a bottom surface of the PET film,

wherein refractive indices of the base layer and the one or more removable lens layers are matched to within 0.2, and a 320 nm transmission of the face shield is less than 5%.

13. A surface mountable protective lens stack comprising:

a base layer including a polyethylene terephthalate (PET) film having a thickness of 7 to 8 mil and containing a UV blocking additive;

one or more removable lens layers stacked on top of the base layer, each of the removable lens layers including a PET film having a thickness of 1 to 4 mil and a first adhesive disposed on a bottom surface of the PET film,

wherein the base layer further includes a second adhesive disposed on a bottom surface of the PET film containing the UV blocking additive, the second adhesive having a pull strength greater than that of the first adhesive,

wherein refractive indices of the base layer and the one or more removable lens layers are matched to within 0.2, a total haze of the protective lens stack is 2% or less, a 320 nm transmission of the protective lens stack is less than 5%, and a visible light transmission (VLT) of the protective lens stack is 87% or greater.

Assignments (6)

Continuity (3)

References Cited (400)

Cited By (1)

US 12,685,353