US4670914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eye protectors
Assignee: BTG International Ltd
•
Filing: 1986-02-19
•
Granted: 1987-06-09
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Expires: 2006-02-19
Abstract
Abstract An eye protector comprising a lens structure spanning a wearers eye in use, a circumambient wall member projecting rearwardly from the lens structure and spacing the lens structure from the wearers face in use while leaving a substantially clear flow path for air across an interior central zone of said eye protector, said wall member having a plurality of ventilation apertures each provided with a rearwardly angled cowl preferably 10 to 20 mm deep and set at from 60° to 90° to the angle of vision and each providing individually a substantially unobstructed ventilation area of at least 80 mm 2 e.g. 250 mm 2 and in aggregate providing a substantially unobstructed ventilation area of at least 500 mm 2 e.g. 1000 mm 2 each side of said central zone.
Inventors
- 👤 Geoffrey W. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:11
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/02; A61F9/028
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
104 words
An eye protector comprising a lens structure spanning a wearers eye in use, a circumambient wall member projecting rearwardly from the lens structure and spacing the lens structure from the wearers face in use whilst leaving a substantially clear flow path for air across an interior central zone of said eye protector, said wall member having a plurality of ventilation apertures each provided with a rearwardly angled cowl and each providing individually a substantially unobstructed ventilation area of at least 80 mm 2 and in aggregate providing a substantially unobstructed ventilation area of at least 500 mm 2 each side of said central zone.
Claim 2
Dependent Claim
104 words
An eye protector comprising a lens structure spanning a wearers eye in use, a circumambient wall member projecting rearwardly from the lens structure and spacing the lens structure from the wearers face in use whilst leaving a substantially clear flow path for air across an interior central zone of said eye protector, said wall member having a plurality of ventilation apertures each provided with a rearwardly angled cowl and each providing individually a substantially unobstructed ventilation area of at least 80 mm 2 and in aggregate providing a substantially unobstructed ventilation area of at least 500 mm 2 each side of said central zone.
Claim 3
Dependent Claim
26 words
An eye protector as claimed in claim 1 wherein each said ventilation aperture has individually a substantially unobstructed area of at most 530 mm 2 .
Claim 4
Dependent Claim
24 words
An eye protector as claimed in claim 2 wherein each said ventilation aperture has individually an unobstructed area of about 250 mm 2 .
Claim 5
Dependent Claim
28 words
An eye protector as claimed claim 1 wherein each cowl has over its entire length a cross-sectional area at least substantially equal to that of the respective aperture.
Claim 6
Dependent Claim
20 words
An eye protector as claimed in claim 1 wherein each aperture and, in cross section, each cowl is generally circular.
Claim 7
Dependent Claim
22 words
An eye protector as claimed in claim 5 wherein each aperture and cowl has a diameter of from 10 to 26 mm.
Claim 8
Dependent Claim
22 words
An eye protector as claimed in claim 6 wherein each aperture and cowl has a diameter of from 15 to 21 mm.
Claim 9
Dependent Claim
20 words
An eye protector as claimed in claim 7 wherein each aperture and cowl has a diameter of approximately 18 mm.
Claim 10
Dependent Claim
34 words
An eye protector as claimed in claim 1 wherein each cowl has a length, measured axially along the longest portion of the interior of the defining wall thereof, of at most than 25 mm.
Claim 11
Dependent Claim
17 words
An eye protector as claimed in claim 9 wherein said measurement is at most than 20 mm.
Claim 12
Dependent Claim
17 words
An eye protector as claimed in claim 10 wherein said measurement is from 10 to 20 mm.
Claim 13
Dependent Claim
34 words
An eye protector as claimed in claim 1 wherein the plane of the exterior opening of each cowl forms an angle of at least 30 degrees to the optical axis of the eye protector.
Claim 14
Dependent Claim
16 words
An eye protector as claimed in claim 12 wherein said angle is at least 45 degrees.
Claim 15
Dependent Claim
25 words
An eye protector as claimed in claim 13 wherein for a substantial proportion of said cowls said angle is from 60 degrees to 90 degrees.
Claim 16
Dependent Claim
68 words
An eye protector as claimed in claim 1 wherein at least one of the ventilation apertures is provided in each of the two opposed side portions of said circumambient wall member, at least one of said ventilation apertures are provided in a bottom portion of said circumambient wall member and at least one of said apertures is also provided in a top portion of the circumambient wall member.
Claim 17
Dependent Claim
41 words
An eye protector as claimed in claim 1 wherein the circumambient wall member is such as to provide a frame depth of at least 20 mm measured at the closest approach of the lens member to a wearer's forehead in use.
Claim 18
Dependent Claim
16 words
An eye protector as claimed in claim 16 wherein said measurement is at least 25 mm.
Claim 19
Dependent Claim
16 words
An eye protector as claimed in claim 17 wherein said measurement is at least 30 mm.
Claim 20
Dependent Claim
21 words
An eye protector as claimed in claim 1 wherein the total ventilation area provided is at least 1500 mm 2 .
Claim 21
Dependent Claim
19 words
An eye protector as claimed in claim 19 wherein said ventilation area is at least 2000 mm 2 .
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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) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |