US3471987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positioning,spacing and supporting device
Assignee: DELBERT F YELSMA
•
Filing: 1967-11-21
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Granted: 1969-10-14
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Expires: 1987-11-21
Abstract
No abstract record available.
Inventors
- 👤 Delbert F Yelsma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:11
CPC Classifications
F; F16; F16L; F16L3/00; F16L3/08; F16L3/12; F16L3/13; E; E04; E04C; E04C5/00; E04C5/16; E04C5/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1123107A
Cited
US2409342A
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US3209509A
Cited
US3233383A
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GB986450A
Cited
US3348347A
Cited
FR1477159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |