US3225647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for viewing gems and similar objects
Assignee: Individual
•
Filing: 1961-12-28
•
Granted: 1965-12-28
•
Expires: 1981-12-28
Abstract
No abstract record available.
Inventors
- 👤 Robinson Douglas Albert
- 👤 Robinson Lytton Melville
- 👤 Dods James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:35
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/02; G02B27/022; G02B27/024; G02B27/025; G02B21/00; G02B21/0004; G02B21/0016
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
APPARATUS FOR PROJECTING AN IMAGE OF A GEM, INCLUDING A HOLLOW HOLDER TO SUPPORT SAID GEM, A LIGHT SOURCE WITHIN SAID HOLDER TO ILLUMINATE SAID GEM, AND PROJECTING MEANS CONSISTING OF A LENS PASSING LIGHT FROM SAID GEM TO A CONCAVE MIRROR AND THENCE DIRECTLY TO AN OBSERVER''S VIEWING POSITION AT THE FOCUS OF SAID MIRROR.
References Cited (Backward Citations)
US1699689A
Cited
US2051946A
Cited
US2192529A
Cited
US2375260A
Cited
US2380567A
Cited
US2489462A
Cited
US2533747A
Cited
US2664028A
Cited
US2569579A
Cited
US2742813A
Cited
GB767838A
Cited
FR1163263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |