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US3372406A
Expired / Lapsed
US
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Ventilated cushion structure
Assignee: Heckethorn Manufacturing Co
•
Filing: 1965-08-03
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Granted: 1968-03-12
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Expires: 1985-08-03
Abstract
No abstract record available.
Inventors
- 👤 John E Heckethorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:21
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/02; A47C7/18; A47C7/28; A47C7/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US482337A
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DE585873C
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FR427154A
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US1152565A
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US1248425A
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US2300718A
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US2954076A
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US3058125A
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US3051966A
Cited
US3103671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |