US3372221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing filamentary microtapes of labyrinthian cross section
Assignee: Dow Chemical Co
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Filing: 1965-08-06
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Granted: 1968-03-05
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Expires: 1985-08-06
Abstract
No abstract record available.
Inventors
- 👤 Lloyd E Lefevre
- 👤 Robert J Mathieson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:06
CPC Classifications
D; D01; D01D; D01D5/00; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/28; D01F6/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2041798A
Cited
US2240274A
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US2615491A
Cited
US3077004A
Cited
US2981052A
Cited
US3001354A
Cited
US2985503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |