US3477181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tombstone frames
Assignee: ROBISON CORP
•
Filing: 1967-11-27
•
Granted: 1969-11-11
•
Expires: 1987-11-27
Abstract
No abstract record available.
Inventors
- 👤 William H Robison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:10
CPC Classifications
E; E04; E04H; E04H13/00; E04H13/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA765148A
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US1139515A
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US1130545A
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US1226743A
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US1442172A
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US1639558A
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US1712801A
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US1931602A
Cited
US1916494A
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US2242266A
Cited
US3005287A
Cited
GB930921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |