US3504746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sealing a walled system with polyvinyl pyrrolidone
Assignee: GAF Corp
•
Filing: 1968-06-19
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Granted: 1970-04-07
•
Expires: 1988-06-19
Abstract
No abstract record available.
Inventors
- 👤 Milton Freifeld
- 👤 George S Mills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:16
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/506; C09K8/508; C09K8/512; C08; C08K; C08K3/00; C08K3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3061569A
Cited
US3208524A
Cited
US3216983A
Cited
US3294729A
Cited
US3282874A
Cited
US3306870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |