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Patent US2948975A successfully refreshed from Google Patents.
US2948975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color slide viewing accessory
Assignee: GAF Chemicals Corp
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Filing: 1957-11-13
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Granted: 1960-08-16
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Expires: 1977-11-13
Abstract
No abstract record available.
Inventors
- 👤 Irving H Fowle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:48
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/02; G02B27/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1024613A
Cited
US1099211A
Cited
US2601619A
Cited
US2580164A
Cited
US2809452A
Cited
US2785485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |