Patent US3473447A successfully refreshed from Google Patents.
US3473447A
Expired / Lapsed
US
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Assignee: Huntingdon Industries Inc
•
Filing: 1968-03-20
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Granted: 1969-10-21
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Expires: 1988-03-20
Abstract
No abstract record available.
Inventors
- 👤 John E Ullman
- 👤 Stanley F Olejkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:56
CPC Classifications
B; B31; B31B; B31B50/00; B31B50/60; B31B50/62; B31B50/64; B31B50/642
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3125007A
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US2414268A
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US2815700A
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US2925758A
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US3134308A
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US3298288A
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US3333514A
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US3291008A
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US3312154A
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US3421415A
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US3397624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |