US3520764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic leather materials
Assignee: WR Grace and Co
•
Filing: 1969-02-05
•
Granted: 1970-07-14
•
Expires: 1989-02-05
Abstract
No abstract record available.
Inventors
- 👤 Richard C Hoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:23
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/0002; D06N3/0015; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/70; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31931; Y10T428/31935; Y10T442/00; Y10T442/20; Y10T442/2369; Y10T442/30; Y10T442/3707; Y10T442/378
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3245863A
Cited
US3317335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |