US2979382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing infrared transmittible arsenic trisulfide
Assignee: Research Corp
•
Filing: 1951-05-10
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Granted: 1961-04-11
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Expires: 1971-05-10
Abstract
No abstract record available.
Inventors
- 👤 Frerichs Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:57
CPC Classifications
C; C01; C01G; C01G28/00; C01G28/008; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904; Y10S65/00; Y10S65/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A METHOD OF MAKING ARSENIC TRISULFIDE HAVING A HIGH TRANSMISSION IN THE INFRARED REGION OF THE SPECTRUM WHICH COMPRISES DISTILLING ARSENIC TRISULFIDE IN A STEAM OF HYDROGEN SULFIDE AND THEREAFTER BOILING THE EXCESS HYDROCARBON SULFIDE OUT OF THE ARSENIC TRISULFIDE.
Claim 2
Independent Claim
40 words
A METHOD OF MAKING ARSENIC TRISULFIDE HAVING A HIGH TRANSMISSION IN THE INFRARED REGION OF THE SPECTRUM WHICH COMPRISES DISTILLING ARSENIC TRISULFIDE IN A STEAM OF HYDROGEN SULFIDE AND THEREAFTER BOILING THE EXCESS HYDROCARBON SULFIDE OUT OF THE ARSENIC TRISULFIDE.
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) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |