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US2986771A
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US
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Sash balance connector
Assignee: WEATHERPROOF PRODUCTS CORP
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Filing: 1958-08-04
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Granted: 1961-06-06
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Expires: 1978-08-04
Abstract
No abstract record available.
Inventors
- 👤 Robert L Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 00:48
CPC Classifications
E; E05; E05D; E05D13/00; E05D13/10; E05D13/12; E05D13/1207
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US29461A
Cited
US1849604A
Cited
DE891079C
Cited
US2846212A
Cited
US2747219A
Cited
US2848760A
Cited
US2862258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |