US3390045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making paper from mica flakes which have been subjected to hot aqua regia
Assignee: United States Department of the Interior
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Filing: 1965-05-27
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Granted: 1968-06-25
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Expires: 1985-05-27
Abstract
No abstract record available.
Inventors
- 👤 Jr John L Miller
- 👤 Kenneth H Ivey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:28
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/36; D21H13/38; D21H13/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR PREPARING MICA PAPER COMPRISING FORMING MICA FLAKES HAVING A THICKNESS TO AREA RATIO OF LESS THAN 1 TO 1000, SUBJECTING SAID FLAKES TO HOT CONCENTRATED AQUA REGIA IN AMOUNT FROM ABOUT 10 ML. TO 20 ML. PER GRAM OF THE MICA, REMOVING THE AQUA REGIA FROM THE FLAKES, FORMING A WATER SUSPENSION OF THE FLAKES, SCREENING THE SUSPENSION AND DRYING TO FORM MICA PAPER.
Claim 2
Dependent Claim
67 words
A PROCESS FOR PREPARING MICA PAPER COMPRISING FORMING MICA FLAKES HAVING A THICKNESS TO AREA RATIO OF LESS THAN 1 TO 1000, SUBJECTING SAID FLAKES TO HOT CONCENTRATED AQUA REGIA IN AMOUNT FROM ABOUT 10 ML. TO 20 ML. PER GRAM OF THE MICA, REMOVING THE AQUA REGIA FROM THE FLAKES, FORMING A WATER SUSPENSION OF THE FLAKES, SCREENING THE SUSPENSION AND DRYING TO FORM MICA PAPER.
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) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |