US3528668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular inter-wall seal unit
Assignee: Thunderline Corp
•
Filing: 1967-08-14
•
Granted: 1970-09-15
•
Expires: 1987-08-14
Abstract
No abstract record available.
Inventors
- 👤 Bruce G Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:30
CPC Classifications
F; F16; F16L; F16L5/00; F16L5/02; F16L5/08; F16J; F16J15/00; Y; Y10; Y10S; Y10S277/00; Y10S277/916
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US750534A
Cited
US795444A
Cited
US703469A
Cited
GB599533A
Cited
US2743780A
Cited
US2968500A
Cited
US3045830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |