Patent US2890899A successfully refreshed from Google Patents.
US2890899A
Expired / Lapsed
US
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Multiple duct sleeve
Assignee: PLYMOUTH IND PRODUCTS Inc
•
Filing: 1955-10-31
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Granted: 1959-06-16
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Expires: 1975-10-31
Abstract
No abstract record available.
Inventors
- 👤 Aldred J Simmons
- 👤 Anthony J Barta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:09
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/02; F16L21/025; F16L37/00; F16L37/56; H; H02; H02G; H02G9/00; H02G9/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2799533A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-15 | 1962-12-15 | 1963-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-15 | 1966-12-15 | 1967-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-15 | 1970-12-15 | 1971-06-16 | $7700.00 | Window Closed / Lapsed |