US3496000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making artificial leather
Assignee: Porvair PLC
•
Filing: 1966-03-30
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Granted: 1970-02-17
•
Expires: 1986-03-30
Abstract
No abstract record available.
Inventors
- 👤 Graham Rodney Hull
- 👤 David Leonard Boutle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; D06M; D06M17/00; D06M17/04; D06M17/10; Y; Y10; Y10S; Y10S428/00; Y10S428/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |