US4056952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond bearing microscopic certificate of appraisal
Assignee: Individual
•
Filing: 1976-04-01
•
Granted: 1977-11-08
•
Expires: 1996-04-01
Abstract
Abstract A diamond with an inscription comprises a diamond gem structure having an outer surface cut and polished into a specific shape and a microscopic inscription formed at a specific position on the outer surface of the diamond gem structure. The inscription has a pattern indicating the results of expert appraisal of the diamond gem structure. The inscription may be formed by a method including cleaning a selected portion of the stone surface, depositing a layer of metal thereon, coating the metal with a photoresist film, producing thereon a photo impression by using a mask, developing the impression, etching away the uncoated metal portions and then removing the photoresist.
Inventors
- 👤 Kazumi Okuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:18
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; A; A44; A44C; A44C17/00; C04B41/45; C04B41/50; C04B41/51; C04B41/5133; C04B41/80; C04B41/81; C04B41/85; C04B41/88; G; G03; G03F; G03F7/00; Y; Y10; Y10S; Y10S283/00; Y10S283/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A diamond with an inscription, comprising a diamond gem structure having an outer surface cut and polished into a specific shape, and integrally provided means intimately and securely adhered to said gem structure for functioning as a permanent certificate of appraisal of the diamond, said means including a microscopic inscription formed at a specific position on said outer surface, said inscription having a pattern indicating the results of expert appraisal of said gem structure.
Claim 2
Dependent Claim
74 words
A diamond with an inscription, comprising a diamond gem structure having an outer surface cut and polished into a specific shape, and integrally provided means intimately and securely adhered to said gem structure for functioning as a permanent certificate of appraisal of the diamond, said means including a microscopic inscription formed at a specific position on said outer surface, said inscription having a pattern indicating the results of expert appraisal of said gem structure.
Claim 3
Dependent Claim
22 words
The diamond as defined in claim 1, wherein said gem structure has a culet, and said inscription is formed on said culet.
Claim 4
Dependent Claim
22 words
The diamond as defined in claim 1, wherein said gem structure has a table, and said inscription is formed on said table.
Claim 5
Dependent Claim
63 words
The diamond as defined in claim 3, wherein said inscription is formed by causing a metal layer to adhere to said table, forming a photoresist film on said metal layer, causing a mask having said pattern to lie intimately on said film, exposing to light said mask and unmasked parts of said film, developing said film, and subjecting said metal layer to etching.
Claim 6
Dependent Claim
32 words
The diamond as defined in claim 1, wherein said inscription is formed by causing a metal layer to adhere to said outer surface and subjecting said metal layer to a photo-etching process.
Claim 7
Dependent Claim
16 words
The diamond as defined in claim 5, wherein said metal layer is a layer of chromium.
References Cited (Backward Citations)
US1902830A
Cited
US2093601A
Cited
FR1047620A
Cited
US3576630A
Cited
US3571957A
Cited
DE2512983A1
Cited
US3959527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |