Patent US3549475A successfully refreshed from Google Patents.
US3549475A
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Method for increasing the flex life of synthetic leather and product produced thereby
Assignee: Celanese Corp
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Filing: 1967-05-24
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Granted: 1970-12-22
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Expires: 1987-05-24
Abstract
No abstract record available.
Inventors
- 👤 Jack Darrell Hefley
- 👤 William Hugo West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:18
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/0056; D06N3/0061; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249986; Y10T428/31504; Y10T428/31551; Y10T428/31598; Y10T428/31652; Y10T428/31663; Y10T428/31844; Y10T428/31848; Y10T428/31851; Y10T442/00; Y10T442/20; Y10T442/2139; Y10T442/2311; Y10T442/2328; Y10T442/2336
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2635060A
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US2824816A
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US3276891A
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US3336183A
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US3262805A
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US3277000A
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US3387989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |