US3226743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluteless taps
Assignee: British Tap and Die Co Ltd
•
Filing: 1961-12-19
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Granted: 1966-01-04
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Expires: 1981-12-19
Abstract
No abstract record available.
Inventors
- 👤 Watkins Douglas Mackenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:15
CPC Classifications
B; B23; B23G; B23G7/00; B23G7/02; B23G5/00; B23G5/02; B23G5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A FLUTELESS TAP HAVING A CENTRAL AND A COMPLETELY FORMED THREAD WHICH VARIES IN ITS DISTANCE FROM SAID AXIS SO AS TO PRESENT AT LEAST TWO CIRCUMFERENTIALLY SPACED CRESTS, AS VIEWED IN A CROSS-SECTION NORMAL TO SAID AXIS, EACH CREST BEING FORMED BY THE JUNCTION OF A STEEPLY RELIEVE LEADING PART AND PROGRESSIVELY RELIEVED TRAILING PART, THE RELIEF OF WHICH BEGINS AT THE JUNCTION WITH THE STEEPLY RELIEVED LEADING PART, WHEREBY THE THREAD IS AT A MAXIMUM DISTANCE FROM THE AXIS OF THE TAP ONLY AT SHARP CRESTS ASND CONSEQUENTLY MINIMIZES THE CUTTING TORQUE REQUIRED.
Claim 2
Dependent Claim
95 words
A FLUTELESS TAP HAVING A CENTRAL AND A COMPLETELY FORMED THREAD WHICH VARIES IN ITS DISTANCE FROM SAID AXIS SO AS TO PRESENT AT LEAST TWO CIRCUMFERENTIALLY SPACED CRESTS, AS VIEWED IN A CROSS-SECTION NORMAL TO SAID AXIS, EACH CREST BEING FORMED BY THE JUNCTION OF A STEEPLY RELIEVE LEADING PART AND PROGRESSIVELY RELIEVED TRAILING PART, THE RELIEF OF WHICH BEGINS AT THE JUNCTION WITH THE STEEPLY RELIEVED LEADING PART, WHEREBY THE THREAD IS AT A MAXIMUM DISTANCE FROM THE AXIS OF THE TAP ONLY AT SHARP CRESTS ASND CONSEQUENTLY MINIMIZES THE CUTTING TORQUE REQUIRED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |