Patent US2224022A successfully refreshed from Google Patents.
Patent US2420286A successfully refreshed from Google Patents.
US2420286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemiluminescent compositions
Assignee: Wyeth Holdings LLC
•
Filing: 1943-03-03
•
Granted: 1947-05-06
•
Expires: 1963-03-03
Abstract
No abstract record available.
Inventors
- 👤 Harold T Lacey
- 👤 Henry E Millson
- 👤 Frederick H Heiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:12
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06; C09K11/07; Y; Y10; Y10S; Y10S252/00; Y10S252/965; Y10T; Y10T436/00; Y10T436/13
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2120430A
Cited
US2035267A
Cited
US2274252A
Cited
US2142291A
Cited
US2275979A
Cited
US2236513A
Cited
US2338719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |