US3030710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micro-precision levels
Assignee: Individual
•
Filing: 1956-06-06
•
Granted: 1962-04-24
•
Expires: 1976-06-06
Abstract
No abstract record available.
Inventors
- 👤 William B Fell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:23
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/18; G01C9/24; G01C9/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
AS AN ARTICLE OF MANUFACTURE, A CIRCULAR COVER GLASS FOR A SPHERICAL SPIRIT LEVEL MADE OF PLATE GLASS, HAVING PARALLET FLAT TOP AND BOTTOM SURFACES, AND A PLANO-CONCAVE CIRCULA BOTTOM GLASS OF FUSED QUARTZ SEPARATE FROM BUT DISPOSED BELOW THE BOTTOM FACE OF SAID COVER GLASS WHEN BOTH OF SAID GLASSES ARE IN OPERATIVE POSITION IN A CUP IN A LEVEL WITH THE CONCAVE FACE DOWN, SAID CONCAVE FACE BEING SPHERICALLY CONFORMED ON A RADIUS THAT IS LARGE IN RELATION TO THE RADIUS OF SAID COVER GLASS AND BOTTOM GLASS, ONE OF SAID GLASSES BEING MARKED ON ONE FACE TO PROVIDE GRADUATION LINES IN TRANSVERSE RELATION.
Claim 2
Dependent Claim
106 words
AS AN ARTICLE OF MANUFACTURE, A CIRCULAR COVER GLASS FOR A SPHERICAL SPIRIT LEVEL MADE OF PLATE GLASS, HAVING PARALLET FLAT TOP AND BOTTOM SURFACES, AND A PLANO-CONCAVE CIRCULA BOTTOM GLASS OF FUSED QUARTZ SEPARATE FROM BUT DISPOSED BELOW THE BOTTOM FACE OF SAID COVER GLASS WHEN BOTH OF SAID GLASSES ARE IN OPERATIVE POSITION IN A CUP IN A LEVEL WITH THE CONCAVE FACE DOWN, SAID CONCAVE FACE BEING SPHERICALLY CONFORMED ON A RADIUS THAT IS LARGE IN RELATION TO THE RADIUS OF SAID COVER GLASS AND BOTTOM GLASS, ONE OF SAID GLASSES BEING MARKED ON ONE FACE TO PROVIDE GRADUATION LINES IN TRANSVERSE RELATION.
References Cited (Backward Citations)
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Cited
US2215310A
Cited
US2316777A
Cited
US2338271A
Cited
US2514492A
Cited
US2565628A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |