Patent US4353157A successfully refreshed from Google Patents.
Patent US234798A successfully refreshed from Google Patents.
Patent US2955973A successfully refreshed from Google Patents.
Patent US2876203A successfully refreshed from Google Patents.
Patent US2904420A successfully refreshed from Google Patents.
US2904420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas producing compositions
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1957-06-25
•
Granted: 1959-09-15
•
Expires: 1977-06-25
Abstract
No abstract record available.
Inventors
- 👤 Holker Kenneth Urmston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:45
CPC Classifications
C; C06; C06B; C06B23/00; C06B23/001; C06B25/00; C06B25/34; C06B31/00; C06B31/28; C06B31/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |