US3871104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alignment sighting device
Assignee: Individual
•
Filing: 1973-12-05
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Granted: 1975-03-18
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Expires: 1993-12-05
Abstract
Abstract An alignment sighting device comprising a pair of hollow lenses in an eyeglass frame, each having intersecting horizontal and vertical cross-hairs and colored liquid filling the hollow interior of the lenses to the level of the horizontal cross-hair for registration with the latter.
Inventors
- 👤 Ii John V Underhill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:27
CPC Classifications
G; G02; G02C; G02C5/00; G02C5/001; G02C9/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
An eyeglasses-type alignment sighting device comprising: an eyeglasses frame; a pair of laterally spaced lenses in said frame for the wearer''s left and right eyes, respectively; each of said lenses having a hollow interior and having a horizontal sighting line extending laterally across it; and a non-transparent liquid filling the hollow interior of each lens to the level of the horizontal sighting line thereon so that the top of the liquid registers with said horizontal sighting line when the latter is precisely horizontal.
Claim 2
Dependent Claim
83 words
An eyeglasses-type alignment sighting device comprising: an eyeglasses frame; a pair of laterally spaced lenses in said frame for the wearer''s left and right eyes, respectively; each of said lenses having a hollow interior and having a horizontal sighting line extending laterally across it; and a non-transparent liquid filling the hollow interior of each lens to the level of the horizontal sighting line thereon so that the top of the liquid registers with said horizontal sighting line when the latter is precisely horizontal.
Claim 3
Dependent Claim
29 words
An alignment sighting device according to claim 1, and further comprising a vertical sighting line on each lens which perpendicularly intersects the respective horizontal sighting line on said lens.
Claim 4
Dependent Claim
24 words
An alignment sighting device according to claim 2, wherein each vertical sighting line intersects the respective horizontal sighting line substantially midway across the lens.
Claim 5
Dependent Claim
14 words
An alignment sighting device according to claim 3, wherein said non-transparent liquid is colored.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |