Patent US2428333A successfully refreshed from Google Patents.
US2428333A
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US
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Assignee: GAF Chemicals Corp
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Filing: 1943-10-30
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Granted: 1947-09-30
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Expires: 1963-10-30
Abstract
No abstract record available.
Inventors
- 👤 Lew W Lessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:49
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/04; G03B27/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US880345A
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US909534A
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US1000247A
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US1186653A
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US1651441A
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US1812199A
Cited
US2255811A
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US2344405A
Cited
US2371594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-29 | 1951-03-31 | 1951-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-29 | 1955-03-31 | 1955-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-29 | 1959-03-31 | 1959-09-30 | $7700.00 | Window Closed / Lapsed |