Patent US3508464A successfully refreshed from Google Patents.
US3508464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure control apparatus
Assignee: AT&T Inc
•
Filing: 1966-11-04
•
Granted: 1970-04-28
•
Expires: 1986-11-04
Abstract
No abstract record available.
Inventors
- 👤 Vincent Kruchowy
- 👤 Frank Wahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:42
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/16; B30B15/22; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8326; Y10T137/8593; Y10T137/86389
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1898147A
Cited
FR363560A
Cited
US1437626A
Cited
US1426718A
Cited
US2064053A
Cited
US2127265A
Cited
US2367242A
Cited
US2329686A
Cited
US2674230A
Cited
US2801442A
Cited
US2857964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-27 | 1973-10-27 | 1974-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-27 | 1977-10-27 | 1978-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-27 | 1981-10-27 | 1982-04-28 | $7700.00 | Window Closed / Lapsed |