US2965455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing hydrogen sulfide
Assignee: Hooker Chemical Corp
•
Filing: 1957-11-04
•
Granted: 1960-12-20
•
Expires: 1977-11-04
Abstract
No abstract record available.
Inventors
- 👤 Aylmer H Maude
- 👤 Donald E Macfadyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:39
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/16; C01B17/161; C01B17/162
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US688020A
Cited
US1666251A
Cited
US1700578A
Cited
US1917716A
Cited
DE558432C
Cited
US2098148A
Cited
US2263363A
Cited
US2538738A
Cited
US2852564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |