US2687940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Office
Assignee: —
•
Filing: —
•
Granted: 1954-08-31
•
Expires: 1971-08-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:35
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/02; D06P1/12; C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/50; C09B57/00; C09B57/002; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/79; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921; Y10S8/922; Y10S8/924; Y10S8/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
2,3,6,8-TETRAHALOGENO-5-AMINO-1,4-NAPHTHOQUINONE, WHEREIN ONE OF THE 2,3-HALOGENS IS CHLORINE, WHILE THE REMAINING HALOGEN ARE BROMINE.
Claim 2
Dependent Claim
14 words
2,3,6,8-TETRAHALOGENO-5-AMINO-1,4-NAPHTHOQUINONE, WHEREIN ONE OF THE 2,3-HALOGENS IS CHLORINE, WHILE THE REMAINING HALOGEN ARE BROMINE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |