US3793047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the surface properties of biologically formed calcium carbonate bodies
Assignee: Individual
•
Filing: 1971-08-25
•
Granted: 1974-02-19
•
Expires: 1991-08-25
Abstract
Abstract Biologically formed calcium carbonate bodies such as mother-ofpearl, natural pearls, and cultured pearls as well as products made therefrom are improved as to their surface properties by subjecting the bodies to the action of an aqueous solution containing a soluble fluoride or silicofluoride for a time sufficient to permit formation of an opalescent abrasion and acid resistant, firmly adhering surface coating consisting essentially of calcium fluoride.
Inventors
- 👤 Massenhausen W Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:59
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B44; B44F; B44F9/00; B44F9/08; C04B41/45; C04B41/50; C04B41/5018; C04B41/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
34 words
A process as defined in claim 1 in which the treatment is effected at a temperature of 20*C for a period sufficient to form an opalescent firmly adherent coating consisting essentially of calcium fluoride.
Claim 2
Dependent Claim
20 words
A process as defined in claim 1 in which the article that is subjected to treatment is a mussel shell.
Claim 3
Dependent Claim
29 words
The process of claim 1, wherein a portion of the surface of the product is shielded so as to limit the effects of the treatment to the remaining area.
Claim 4
Dependent Claim
28 words
The process of claim 1, wherein the product consists of mother-of-pearl and is subjected to a pretreatment with an aldehyde preliminarily to condense the albumin in the mother-of-pearl.
Claim 5
Dependent Claim
10 words
The process of claim 5, wherein the aldehyde is formaldehyde.
Claim 6
Dependent Claim
27 words
A process as defined in claim 1 in which the article that is subjected to treatment is a natural or cultured pearl or consists essentially of mother-of-pearl.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |